Ford Ecosport: Climate Control System - General Information / Diagnosis and Testing - Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC)

Ford Ecosport 2014-2025 Service and Repair Manual / Climate Control System / Climate Control System - General Information / Diagnosis and Testing - Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC)

DTC Charts

DTC Chart: Powertrain Control Module (PCM)

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices,
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

Network Diagnostic Trouble Codes (DTCs) (U-codes) are often a result of intermittent concerns such as damaged wiring or low battery voltage occurrences. Additionally, vehicle repair procedures, such as module reprogramming, often set network Diagnostic Trouble Codes (DTCs). Replacing a module to resolve a network DTC is unlikely to resolve the concern. To prevent repeat network DTC concerns, inspect all network wiring, especially connectors. Test the vehicle battery.
REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

DTC	Description	Action
P0532	A/C Refrigerant Pressure Sensor "A" Circuit Low	GO to Pinpoint Test A
P0533	A/C Refrigerant Pressure Sensor "A" Circuit High	GO to Pinpoint Test A
P0645	A/C Clutch Relay Control Circuit	GO to Pinpoint Test B
P0646	A/C Clutch Relay Control Circuit Low	GO to Pinpoint Test B
P0647	A/C Clutch Relay Control Circuit High	GO to Pinpoint Test B
P06A0	Variable A/C Compressor Control Circuit	GO to Pinpoint Test W
P1461	A/C Pressure Sensor Circuit High	GO to Pinpoint Test A
P1462	A/C Pressure Sensor Circuit Low	GO to Pinpoint Test A
P1464	A/C Demand Out Of Self Test Range	GO to Pinpoint Test I
P193E	A/C Clutch Request Signal	GO to Pinpoint Test X
P2600	Coolant Pump "A" Control Circuit/Open	GO to Pinpoint Test Y
P2601	Coolant Pump "A" Control Circuit Performance/Stuck Off	GO to Pinpoint Test Y
P2602	Coolant Pump "A" Control Circuit Low	GO to Pinpoint Test Y
P2603	Coolant Pump "A" Control Circuit High	GO to Pinpoint Test Y
All Other PCM Diagnostic Trouble Codes (DTCs)	—	Refer to the appropriate 303-14 section, diagnosis and testing, PCM DTC Chart.

DTC Chart: Heating Ventilation Air Conditioning (HVAC) Control Module - Electronic Automatic Temperature Control (EATC)

Condition	Possible Sources	Actions
B102E:11	Air Quality Sensor: Circuit Short To Ground	GO to Pinpoint Test V
B102E:15	Air Quality Sensor: Circuit Short To Battery or Open	GO to Pinpoint Test V
B102E:92	Air Quality Sensor: Performance or Incorrect Operation	GO to Pinpoint Test V
B1034:11	Left Front Seat Heater Element: Circuit Short To Ground	Refer to the appropriate section in Group 501 for the procedure.
B1034:12	Left Front Seat Heater Element: Circuit Short To Battery	Refer to the appropriate section in Group 501 for the procedure.
B1034:13	Left Front Seat Heater Element: Circuit Open	Refer to the appropriate section in Group 501 for the procedure.
B1036:11	Right Front Seat Heater Element: Circuit Short To Ground	Refer to the appropriate section in Group 501 for the procedure.
B1036:12	Right Front Seat Heater Element: Circuit Short To Battery	Refer to the appropriate section in Group 501 for the procedure.
B1036:13	Right Front Seat Heater Element: Circuit Open	Refer to the appropriate section in Group 501 for the procedure.
B1038:11	Left Front Seat Heater Sensor: Circuit Short To Ground	Refer to the appropriate section in Group 501 for the procedure.
B1038:15	Left Front Seat Heater Sensor: Circuit Short To Battery or Open	Refer to the appropriate section in Group 501 for the procedure.
B103A:11	Right Front Seat Heater Sensor: Circuit Short To Ground	Refer to the appropriate section in Group 501 for the procedure.
B103A:15	Right Front Seat Heater Sensor: Circuit Short To Battery or Open	Refer to the appropriate section in Group 501 for the procedure.
B105A:12	Cabin Temperature Sensor Fan: Circuit Short To Battery	GO to Pinpoint Test N
B105A:14	Cabin Temperature Sensor Fan: Circuit Short To Ground or Open	GO to Pinpoint Test N
B1081:07	Left Temperature Damper Motor: Mechanical Failure	INSPECT for a loose connector, binding/damaged linkage or door. REPAIR as necessary. If no condition is found, INSTALL a new temperature door actuator. REFER to: Temperature Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
B1081:11	Left Temperature Damper Motor: Circuit Short To Ground	GO to Pinpoint Test J
B1081:12	Left Temperature Damper Motor: Circuit Short To Battery	GO to Pinpoint Test J
B1081:13	Left Temperature Damper Motor: Circuit Open	GO to Pinpoint Test J
B1083:07	Recirculation Damper Motor: Mechanical Failure	INSPECT for a loose connector, binding/damaged linkage or door. REPAIR as necessary. If no condition is found, INSTALL a new air inlet door actuator. REFER to: Air Inlet Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
B1083:11	Recirculation Damper Motor: Circuit Short To Ground	If equipped with air inlet door actuator with 2 circuits, GO to Pinpoint Test D If equipped with air inlet door actuator with 5 circuits, GO to Pinpoint Test E
B1083:12	Recirculation Damper Motor: Circuit Short To Battery	If equipped with air inlet door actuator with 2 circuits, GO to Pinpoint Test D If equipped with air inlet door actuator with 5 circuits, GO to Pinpoint Test E
B1083:13	Recirculation Damper Motor: Circuit Open	If equipped with air inlet door actuator with 2 circuits, GO to Pinpoint Test D If equipped with air inlet door actuator with 5 circuits, GO to Pinpoint Test E
B1086:07	Air Distribution Damper Motor: Mechanical Failure	INSPECT for a loose connector, binding/damaged linkage or door. REPAIR as necessary. If no condition is found, INSTALL a new air distribution door actuator. REFER to: Air Distribution Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
B1086:11	Air Distribution Damper Motor: Circuit Short To Ground	GO to Pinpoint Test F
B1086:12	Air Distribution Damper Motor: Circuit Short To Battery	GO to Pinpoint Test F
B1086:13	Air Distribution Damper Motor: Circuit Open	GO to Pinpoint Test F
B1097:12	Heated Windshield Relay: Circuit Short To Battery	REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
B1097:14	Heated Windshield Relay: Circuit Short To Ground or Open	REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
B10AF:11	Blower Fan Relay: Circuit Short To Ground	GO to Pinpoint Test K
B10AF:15	Blower Fan Relay: Circuit Short To Battery or Open	For blower motor inoperative, GO to Pinpoint Test K For blower motor not shutting off/not operating correctly, GO to Pinpoint Test L
B10B5:11	Left Panel Air Discharge Temperature: Circuit Short To Ground	GO to Pinpoint Test P
B10B5:15	Left Panel Air Discharge Temperature: Circuit Short To Battery or Open	GO to Pinpoint Test P
B10B6:11	Left Floor Air Discharge Temperature: Circuit Short To Ground	GO to Pinpoint Test Q
B10B6:15	Left Floor Air Discharge Temperature: Circuit Short To Battery or Open	GO to Pinpoint Test Q
B10B8:63	Push Buttons: Circuit / Component Protection Time-Out	Buttons held too long may set this DTC . ATTEMPT to clean buttons. CLEAR the Diagnostic Trouble Codes (DTCs) and REPEAT the self-test. If the DTC does not return, IGNORE the DTC and CONTINUE diagnosing other Diagnostic Trouble Codes (DTCs) or symptoms. If the DTC returns, INSTALL a new HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
B10B9:12	Blower Control: Circuit Short To Battery	GO to Pinpoint Test K
B10B9:14	Blower Control: Circuit Short To Ground or Open	GO to Pinpoint Test K
B11E5:11	Left HVAC Damper Position Sensor: Circuit Short To Ground	GO to Pinpoint Test J
B11E5:15	Left HVAC Damper Position Sensor: Circuit Short To Battery or Open	GO to Pinpoint Test J
B11E7:11	Air Distribution Damper Position Sensor: Circuit Short To Ground	GO to Pinpoint Test F
B11E7:15	Air Distribution Damper Position Sensor: Circuit Short To Battery or Open	GO to Pinpoint Test F
B11F0:11	Air Intake Damper Position Sensor: Circuit Short To Ground	GO to Pinpoint Test E
B11F0:15	Air Intake Damper Position Sensor: Circuit Short To Battery or Open	GO to Pinpoint Test E
B12CA:11	Start/Stop "Eco-Start" Status Indicator: Circuit Short To Ground	GO to Pinpoint Test AB
B12CA:15	Start/Stop "Eco-Start" Status Indicator: Circuit Short To Battery or Open	GO to Pinpoint Test AB
B1474:11	Heater Relay 1: Circuit Short To Ground	GO to Pinpoint Test AA
B1474:15	Heater Relay 1: Circuit Short To Battery or Open	GO to Pinpoint Test AA
B147A:11	Heater Relay 2: Circuit Short To Ground	GO to Pinpoint Test AA
B147A:15	Heater Relay 2: Circuit Short To Battery or Open	GO to Pinpoint Test AA
B147C:12	Heated Windshield Relay 2: Circuit Short To Battery	REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
B147C:14	Heated Windshield Relay 2: Circuit Short To Ground or Open	REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
B1A61:11	Cabin Temperature Sensor: Circuit Short To Ground	GO to Pinpoint Test N
B1A61:15	Cabin Temperature Sensor: Circuit Short To Battery or Open	GO to Pinpoint Test N
B1A63:11	Right Solar Sensor Circuit Short To Ground	GO to Pinpoint Test O
B1A63:15	Right Solar Sensor Circuit Short To Battery or Open	GO to Pinpoint Test O
B1A64:11	Left Solar Sensor Circuit Short To Ground	GO to Pinpoint Test O
B1A64:15	Left Solar Sensor Circuit Short To Battery or Open	GO to Pinpoint Test O
B1A69:11	Humidity Sensor: Circuit Short To Ground	GO to Pinpoint Test N
B1A69:15	Humidity Sensor: Circuit Short To Battery or Open	GO to Pinpoint Test N
B1A69:92	Humidity Sensor: Performance or Incorrect Operation	GO to Pinpoint Test N
B1B71:11	Evaporator Temperature Sensor: Circuit Short To Ground	GO to Pinpoint Test M
B1B71:15	Evaporator Temperature Sensor: Circuit Short To Battery or Open	GO to Pinpoint Test M
B1C83:12	Rear Defog Relay: Circuit Short To Battery	REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
B1C83:14	Rear Defog Relay: Circuit Short To Ground or Open	REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
C1B14:11	Sensor supply voltage A: Circuit Short To Ground	GO to Pinpoint Test AC
C1B14:12	Sensor supply voltage A: Circuit Short To Battery	GO to Pinpoint Test AC
U0140:00	Lost Communication With Body Control Module: No Sub Type Information	GO to Pinpoint Test R
U0151:00	Lost Communication With Restraints Control Module: No Sub Type Information	GO to Pinpoint Test S
U0155:00	Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information	GO to Pinpoint Test T
U0253:00	Lost Communication With Accessory Protocol Interface Module: No Sub Type Information	GO to Pinpoint Test Z
U0401:00	Invalid Data Received from ECM/PCM A: No Sub Type Information	This DTC sets when the HVAC control module receives invalid network data for the engine temperature or RPM from the PCM . RETRIEVE and REPAIR all non-network Diagnostic Trouble Codes (DTCs) in the PCM and other modules on the network. REFER to the appropriate 303-14 section. If no Diagnostic Trouble Codes (DTCs) are present in the PCM , DIAGNOSE the observable symptom.
U0401:82	Invalid Data Received from ECM/PCM A: Alive / Sequence Counter Incorrect / Not Updated	This DTC sets when the HVAC control module receives invalid network data for the engine temperature or RPM from the PCM . RETRIEVE and REPAIR all non-network Diagnostic Trouble Codes (DTCs) in the PCM and other modules on the network. REFER to the appropriate 303-14 section. If no Diagnostic Trouble Codes (DTCs) are present in the PCM , DIAGNOSE the observable symptom.
U0422:68	Invalid Data Received From Body Control Module: Event Information	This DTC sets when the HVAC control module receives invalid network data from the BCM . RETRIEVE and REPAIR all non-network Diagnostic Trouble Codes (DTCs) in the BCM and other modules on the network. REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing). If no Diagnostic Trouble Codes (DTCs) are present in the BCM , DIAGNOSE the observable symptom.
U0422:81	Invalid Data Received From Body Control Module: Invalid Serial Data Received	This DTC sets when the HVAC control module receives invalid network data from the BCM . RETRIEVE and REPAIR all non-network Diagnostic Trouble Codes (DTCs) in the BCM and other modules on the network. REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing). If no Diagnostic Trouble Codes (DTCs) are present in the BCM , DIAGNOSE the observable symptom.
U0452:82	Invalid Data Received From Restraints Control Module: Alive / Sequence Counter Incorrect / Not Updated	This DTC sets when the HVAC control module receives invalid network data from the RCM . RETRIEVE and REPAIR all non-network Diagnostic Trouble Codes (DTCs) in the RCM and other modules on the network. REFER to the appropriate 501-20B section. If no Diagnostic Trouble Codes (DTCs) are present in the RCM , DIAGNOSE the observable symptom.
U1000:00	Solid State Driver Protection Active -Driver Disabled: No Sub Type Information	CLEAR all HVAC control module Diagnostic Trouble Codes (DTCs). REPEAT the self-test. If U1000:00 returns, INSTALL a new module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
U2024:51	Control Module Cal-Config Data: Not Programmed	CHECK vehicle service history for recent service actions related to this module. This DTC sets due to incomplete or incorrect Programmable Module Installation (PMI) procedures. If there have been recent service actions with this module, REPEAT/PERFORM the Programmable Module Installation (PMI) procedure as directed by the scan tool. REFER to: Module Programming (418-01 Module Configuration, General Procedures). If there have been no recent service actions, INSTALL a new module to correct the failure to retain configuration data. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
U2100:00	Initial Configuration Not Complete: No Sub Type Information	CHECK vehicle service history for recent service actions related to this module. This DTC sets due to incomplete or incorrect Programmable Module Installation (PMI) procedures. If there have been recent service actions with this module, REPEAT/PERFORM the Programmable Module Installation (PMI) procedure as directed by the scan tool. REFER to: Module Programming (418-01 Module Configuration, General Procedures). If there have been no recent service actions, INSTALL a new module to correct the failure to retain configuration data. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
U3000:41	Control Module: General Checksum Failure	CHECK vehicle service history for recent service actions related to this module. This DTC sets due to incomplete or incorrect Programmable Module Installation (PMI) procedures. If there have been recent service actions with this module, REPEAT/PERFORM the Programmable Module Installation (PMI) procedure as directed by the scan tool. REFER to: Module Programming (418-01 Module Configuration, General Procedures). If there have been no recent service actions, INSTALL a new module to correct the failure to retain configuration data. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
U3000:49	Control Module: Internal Electronic Failure	INSTALL a new module to correct the failure to retain configuration data. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).
U3003:16	Battery Voltage: Circuit Voltage Below Threshold	GO to Pinpoint Test U
U3003:17	Battery Voltage: Circuit Voltage Above Threshold	GO to Pinpoint Test U

Symptom Charts

Symptom Chart – Climate Control Systems

Condition	Possible Sources	Actions
A module does not communicate with the diagnostic scan tool	Fuse(s) Wiring, terminals or connectors module
Externally Controlled Variable Displacement Compressor (EVDC) Performance Check with or without DTC P06A0	Refer to Pinpoint Test	GO to Pinpoint Test W
Unable to duplicate the customer concern and no Diagnostic Trouble Codes (DTCs) present	Refer to Pinpoint Test	GO to Pinpoint Test C
Reduced outlet airflow	Plugged or wet cabin air filter Frozen evaporator	Inspect the cabin air filter. REFER to: Cabin Air Filter (412-00 Climate Control System - General Information, Removal and Installation). GO to Pinpoint Test I
The air inlet door is inoperative or does not operate correctly	Refer to Pinpoint Test	If equipped with air inlet door actuator with 2 circuits, GO to Pinpoint Test D If equipped with air inlet door actuator with 5 circuits, GO to Pinpoint Test E
Incorrect/erratic direction of airflow from outlets	Refer to Pinpoint Test	GO to Pinpoint Test F
Insufficient, erratic or no heat	Refer to Diagnostic Routine	GO to Pinpoint Test G
The Air Conditioning (A/C) is inoperative with no Diagnostic Trouble Codes (DTCs)	Refer to Pinpoint Test	GO to Pinpoint Test H
Insufficient A/C (air conditioning) cooling	Improper refrigerant level Temperature door actuator	CARRY OUT the refrigerant system tests. Refer to the appropriate Refrigerant System Tests procedure in Group 412. If OK, DIAGNOSE for a temperature door actuator not operating correctly. GO to Pinpoint Test J
The Air Conditioning (A/C) is always on — Air Conditioning (A/C) mode always commanded ON	Refer to Pinpoint Test	GO to Pinpoint Test I
Temperature control is inoperative or does not operate correctly	Refer to Pinpoint Test	GO to Pinpoint Test J
The blower motor is inoperative	Refer to Pinpoint Test	GO to Pinpoint Test K
The blower motor does not operate correctly	Refer to Pinpoint Test	GO to Pinpoint Test L
Insufficient Heat In Auto Start-Stop Mode Only	Refer to Pinpoint Test	GO to Pinpoint Test Y
Air Conditioning (A/C) pressure relief valve discharging	A/C pressure relief valve High system pressure	Using a manifold gauge set, CHECK the A/C system pressure. If the pressure is below the A/C pressure relief valve open pressure, 3,447-4,137 kPa (500-600 psi), INSTALL a new A/C Compressor. Refer to the appropriate A/C Compressor - Removal and Installation procedure in Group 412. If the A/C system pressure is above the A/C pressure relief valve open pressure 3,447-4,137 kPa (500-600 psi), REPAIR the A/C system for a restriction.
The Electric Booster Heater Is Inoperative Or Does Not Operate Correctly	Refer to Pinpoint Test	GO to Pinpoint Test AA

Symptom Chart – Noise, Vibration, and Harshness (NVH)

Condition	Possible Sources	Actions
Noisy A/C compressor	A/C compressor bearing worn	INSPECT the A/C compressor pulley bearing for roughness. If bearing roughness is found, INSTALL a new A/C Clutch and A/C Field Coil. REFER to: Air Conditioning (A/C) Clutch and Air Conditioning (A/C) Clutch Field Coil (412-00 Climate Control System - General Information, General Procedures).
Excessive hissing from the plenum when the A/C is on	Low refrigerant charge	INSPECT the A/C system for a low refrigerant charge. REFER to: Electronic Leak Detection - Vehicles With: R134A Refrigerant (412-00 Climate Control System - General Information, General Procedures). REFER to: Fluorescent Dye Leak Detection - Vehicles With: R134A Refrigerant (412-00 Climate Control System - General Information, General Procedures). REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging - Vehicles With: R134A Refrigerant (412-00 Climate Control System - General Information, General Procedures).

Pinpoint Tests

PINPOINT TEST A: P0532, P0533, P1461, P1462

Refer to Wiring Diagrams Cell 22 for schematic and connector information. Refer to Wiring Diagrams Cell 23 for schematic and connector information. Refer to Wiring Diagrams Cell 24 for schematic and connector information. Refer to Wiring Diagrams Cell 25 for schematic and connector information. Refer to Wiring Diagrams Cell 26 for schematic and connector information. Refer to Wiring Diagrams Cell 27 for schematic and connector information.

Normal Operation and Fault Conditions

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. For information about these practices, REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

The A/C pressure transducer receives a ground from the PCM . A 5-volt reference voltage is supplied to the A/C pressure transducer from the PCM . The A/C pressure transducer then sends a voltage to the PCM to indicate the A/C pressure.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P0532:00	A/C Refrigerant Pressure Sensor 'A' Circuit Low: No Sub Type Information	The A/C pressure transducer inputs a feedback voltage to the PCM . This DTC sets if the feedback voltage is less than 0.620 volt for at least 1 second and the ambient air temperature is greater than 0°C (32°F).
PCM P0533:00	A/C Refrigerant Pressure Sensor 'A' Circuit High: No Sub Type Information	The A/C pressure transducer inputs a feedback voltage to the PCM . This DTC sets if the feedback voltage is greater than 4.90 volts for at least 1 second and the ambient air temperature is greater than 0°C (32°F).
PCM P1461:00	A/C Pressure Sensor Circuit High: No Sub Type Information	The PCM senses high voltage (diesel).
PCM P1462:00	A/C Pressure Sensor Circuit Low: No Sub Type Information	The PCM senses low voltage (diesel).

Possible Sources

Wiring, terminals or connectors
A/C pressure transducer
PCM

Visual Inspection and Pre-checks

Inspect for loose or corroded PCM and A/C pressure transducer connections.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

A1 COMPARE THE PCM (POWERTRAIN CONTROL MODULE) PRESSURE SENSOR (ACP_PRESS) PID (PARAMETER IDENTIFICATION) WITH THE MANIFOLD GAUGE SET READINGS

Allow the A/C system to stabilize to the outside ambient temperature.

Ignition ON.

Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM ACP_PRESS PID .

Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID within ± 103 kPa (15 psi)?

Yes

IGNORE the Diagnostic Trouble Codes (DTCs). REFER to the Symptom Chart in this section.

GO to A2

A2 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect PCM 1.0L M/T C1233B, 1.0L A/T C1232B, 1.5L Duratec M/T C1551B, 1.5L Duratec A/T C1926B, 1.5L Duratorque C1381B or 2.0L Duratec C1915B .

Disconnect A/C pressure transducer C1062.

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C1062-1		Ground
C1062-2		Ground
C1062-3		Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to A3

A3 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C1062-1		Ground
C1062-2		Ground
C1062-3		Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to A4

No	REPAIR the circuit.

A4 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

1.0L M/T

Positive Lead	Measurement / Action	Negative Lead
C1062-1		C1233B-17
C1062-2		C1233B-52
C1062-3		C1233B-11

Click to display connectors

1.0L A/T

Positive Lead	Measurement / Action	Negative Lead
C1062-1		C1232B-18
C1062-2		C1232B-52
C1062-3		C1232B-11

Click to display connectors

1.5L Duratec M/T

Positive Lead	Measurement / Action	Negative Lead
C1062-1		C1551B-9
C1062-2		C1551B-21
C1062-3		C1551B-1

Click to display connectors

1.5L Duratec A/T

Positive Lead	Measurement / Action	Negative Lead
C1062-1		C1926B-33
C1062-2		C1926B-44
C1062-3		C1926B-52

Click to display connectors

1.5L Duratorque

Positive Lead	Measurement / Action	Negative Lead
C1062-1		C1381B-45
C1062-2		C1381B-33
C1062-3		C1381B-21

Click to display connectors

2.0L

Positive Lead	Measurement / Action	Negative Lead
C1062-1		C1915B-18
C1062-2		C1915B-52
C1062-3		C1915B-11

Are the resistances less than 3 ohms?

Yes

GO to A5

No	REPAIR the circuit.

A5 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C1062-1		C1062-2
C1062-1		C1062-3
C1062-2		C1062-3

Are the resistances greater than 10,000 ohms?

Yes

INSTALL a new A/C pressure transducer.
REFER to: Air Conditioning (A/C) Pressure Transducer (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to A6

No	REPAIR the circuits.

A6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect all PCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern,

Click here to access Guided Routine (PCM).

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST B: P0645, P0646, P0647

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Voltage is provided to the A/C clutch relay coil. When A/C is requested and A/C line pressures allow, a ground is provided to the A/C clutch relay coil from the PCM , energizing the A/C clutch relay.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P0645:00	A/C Clutch Relay Control Circuit: No Sub Type Information	This DTC sets when the PCM grounds the relay circuit and more voltage than expected is detected on the relay circuit. This DTC also sets when the relay circuit is OFF and no voltage is detected on the relay circuit. The PCM expects to detect voltage coming through the relay coil to the relay circuit when it is not grounding it.
PCM P0646:00	A/C Clutch Relay Control Circuit Low: No Sub Type Information	This DTC sets when the relay circuit is OFF and ground is detected on the relay circuit.
PCM P0647:00	A/C Clutch Relay Control Circuit High: No Sub Type Information	This DTC sets when the PCM grounds the relay circuit and excessive current draw (short to voltage) is detected on the relay circuit while A/C is ON.

Possible Sources

Wiring, terminals or connectors
A/C clutch relay
PCM

Visual Inspection and Pre-checks

Inspect BJB fuses 22 (10A or 5A) and 10 (7.5A).
Inspect the A/C clutch relay for looseness or corrosion.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK THE VOLTAGE TO THE A/C (AIR CONDITIONING) CLUTCH RELAY VOLTAGE SUPPLY CIRCUITS

Ignition OFF.

Disconnect A/C clutch relay.

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
A/C clutch relay socket 1		Ground
A/C clutch relay socket 3		Ground

Are the voltages greater than 11 volts?

Yes

GO to B2

No	VERIFY BJB fuses 22 (10A or 5A) and 10 (7.5A) are OK. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short. If OK, REPAIR the circuit.

B2 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY

Carry out the component test on the A/C clutch relay.
Refer to Wiring Diagrams Cell 149 for schematic and connector information.

Did the relay pass the component test?

Yes

GO to B3

No	INSTALL a new A/C clutch relay.

B3 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect PCM 1.0L M/T C1233B, 1.0L A/T C1232B, 1.5L Duratec M/T C1551B, 1.5L Duratec A/T C1926B, 1.5L Duratorque C1381B or 2.0L Duratec C1915B .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

A/C clutch relay socket 2 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to B4

B4 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

A/C clutch relay socket 2 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to B5

No	REPAIR the circuit.

B5 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY CONTROL CIRCUIT FOR AN OPEN

Measure:
Click to display connectors
1.0L M/T

Positive Lead Measurement / Action Negative Lead

A/C clutch relay socket 2 C1233B-2

Click to display connectors
1.0L A/T

Positive Lead Measurement / Action Negative Lead

A/C clutch relay socket 2 C1232B-2

Click to display connectors
1.5L Duratec M/T

Positive Lead Measurement / Action Negative Lead

A/C clutch relay socket 2 C1551B-40

Click to display connectors
1.5L Duratec A/T

Positive Lead Measurement / Action Negative Lead

A/C clutch relay socket 2 C1926B-58

Click to display connectors
1.5L Duratorque

Positive Lead Measurement / Action Negative Lead

A/C clutch relay socket 2 C1381B-13

Click to display connectors
2.0L

Positive Lead Measurement / Action Negative Lead

A/C clutch relay socket 2 C1915B-2

Is the resistance less than 3 ohms?

Yes

GO to B6

No	REPAIR the circuit.

B6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect all PCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

Click here to access Guided Routine (PCM).

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST C: UNABLE TO DUPLICATE THE CUSTOMER CONCERN AND NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT

Normal Operation and Fault Conditions

This pinpoint test tests the functions of the HVAC system and identifies the correct HVAC symptom pinpoint test.

Possible Sources

Wiring, terminals or connectors
PCM
A/C clutch relay

C1 CHECK THE BLOWER MOTOR OPERATION

Ignition ON.

Select PANEL mode.

Observe blower motor operation and select each blower motor speed.

Does the blower motor operate in all selections and change speed in each?

Yes

GO to C2

No	If the blower motor does not operate in any setting, GO to Pinpoint Test K If the blower motor does not properly change speeds or shut off, GO to Pinpoint Test L

C2 CHECK AIRFLOW OPERATION

Select the highest blower motor setting.

While observing the airflow, select each of the airflow positions (PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST, DEFROST).

Is the airflow directed to the correct outlets?

Yes

GO to C3

No	GO to Pinpoint Test F

C3 VERIFY TEMPERATURE CONTROL OPERATION

Start the vehicle and allow it to reach normal operating temperature.

With the A/C off, select PANEL mode.

Change the temperature setting from the coldest to the warmest and back to the coldest.

Does the temperature change between very warm to cool?

Yes

GO to C4

No	If the temperature does not get very warm, GO to Pinpoint Test G If the temperature does not change at all, GO to Pinpoint Test J

C4 VERIFY THE A/C (AIR CONDITIONING) CLUTCH DOES NOT ENGAGE WITH A/C OFF

With the engine running and the A/C off, select PANEL mode.

Select the coldest temperature setting.

Is the outlet temperature close to ambient temperature?

Yes

GO to C5

No	If the temperature is warmer than ambient temperature, GO to Pinpoint Test J If the outlet temperature is significantly colder than ambient temperature and the A/C compressor clutch engages, GO to Pinpoint Test I

C5 VERIFY A/C (AIR CONDITIONING) CLUTCH ENGAGEMENT IN THE A/C (AIR CONDITIONING) MODE

Make sure the ambient air temperature is above 4°C (39°F).

With the engine running, select PANEL mode.

Press the A/C button (indicator on).

Does the A/C clutch engage when in PANEL mode and the A/C button (indicator on) is pressed?

Yes

GO to C6

No	GO to Pinpoint Test H

C6 CHECK THE RECIRC OPERATION

With the engine running, press the RECIRC button (indicator off).

Select PANEL mode.

Select the highest blower motor setting.

Observe airflow noise.

Press the RECIRC button (indicator on).

Does the airflow noise increase when the RECIRC mode is selected (indicator on)?

Yes

The system is operating normally.

No	If equipped with air inlet door actuator with 2 circuits, GO to Pinpoint Test D If equipped with air inlet door actuator with 5 circuits, GO to Pinpoint Test E

PINPOINT TEST D: THE 2 CIRCUIT AIR INLET DOOR IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

If equipped with air inlet door actuator with 2 circuits, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B1083:11	Recirculation Damper Motor: Circuit Short To Ground	This DTC sets when the HVAC control module senses lower than expected voltage on the motor circuits, indicating a short to ground.
HVAC B1083:12	Recirculation Damper Motor: Circuit Short To Battery	This DTC sets when the HVAC control module senses greater than expected voltage on the motor circuits, indicating a short to voltage.
HVAC B1083:13	Recirculation Damper Motor: Circuit Open	This DTC sets when the HVAC control module senses no voltage on the motor circuits, indicating an open circuit.

Possible Sources

Wiring, terminals or connectors
Air inlet door actuator
HVAC control module

Visual Inspection and Pre-checks

Inspect BCM fuse 21 (7.5A).

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

D1 CHECK THE AIR INLET DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C294A .

Disconnect Air inlet door actuator C289 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C289-1 Ground

C289-6 Ground

Is any voltage present?

Yes

REPAIR the affected circuits.

GO to D2

D2 CHECK THE AIR INLET DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C289-1 Ground

C289-6 Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to D3

No	REPAIR the affected circuits.

D3 CHECK THE AIR INLET DOOR ACTUATOR MOTOR CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C289-1 C294A-24

C289-6 C294A-25

Are the resistances less than 3 ohms?

Yes

GO to D4

No	REPAIR the affected circuits.

D4 CHECK THE AIR INLET DOOR ACTUATOR MOTOR CIRCUITS FOR A SHORT TOGETHER

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C289-1 C289-6

Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new air inlet door actuator.
REFER to: Air Inlet Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to D5

No	REPAIR the circuits.

D5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST E: THE 5 CIRCUIT AIR INLET DOOR IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

If equipped with air inlet door actuator with 5 circuits, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B1083:11	Recirculation Damper Motor: Circuit Short To Ground	This DTC sets when the HVAC control module senses lower than expected voltage on the motor circuits, indicating a short to ground.
HVAC B1083:12	Recirculation Damper Motor: Circuit Short To Battery	This DTC sets when the HVAC control module senses greater than expected voltage on the motor circuits, indicating a short to voltage.
HVAC B1083:13	Recirculation Damper Motor: Circuit Open	This DTC sets when the HVAC control module senses no voltage on the motor circuits, indicating an open circuit.
HVAC B11F0:11	Air Intake Damper Position Sensor: Circuit Short To Ground	The HVAC module senses lower than expected voltage on the feedback potentiometer circuit, indicating a short to ground.
HVAC B11F0:15	Air Intake Damper Position Sensor: Circuit Short To Battery Or Open	The HVAC module senses greater than expected voltage on the feedback potentiometer circuit, indicating a short to voltage or open circuit.

Possible Sources

Wiring, terminals or connectors
Air inlet door actuator
HVAC module

Visual Inspection and Pre-checks

Inspect BCM fuse 21 (7.5A).

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

E1 CHECK THE AIR INLET DOOR ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect Air inlet door actuator C289 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C289-1		Ground
C289-2		Ground
C289-3		Ground
C289-4		Ground
C289-6		Ground

Is any voltage present?

Yes

REPAIR the affected circuits.

GO to E2

E2 CHECK THE AIR INLET DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C289-1		Ground
C289-2		Ground
C289-3		Ground
C289-4		Ground
C289-6		Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to E3

No	REPAIR the affected circuits.

E3 CHECK THE AIR INLET DOOR ACTUATOR CIRCUITS FOR AN OPEN

Disconnect HVAC control module C294A .

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C289-1		C294A-24
C289-2		C294A-2
C289-3		C294A-3
C289-4		C294A-16
C289-6		C294A-25

Are the resistances less than 3 ohms?

Yes

GO to E4

No	REPAIR the affected circuits.

E4 CHECK THE AIR INLET DOOR ACTUATOR CIRCUITS FOR A SHORT TOGETHER

Disconnect Temperature door actuator C2092 .

Disconnect Air distribution door actuator C236 .

Disconnect In-vehicle temperature/humidity sensor C233 .

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C289-1		C289-2
C289-1		C289-3
C289-1		C289-4
C289-1		C289-6
C289-2		C289-3
C289-2		C289-4
C289-2		C289-6
C289-3		C289-4
C289-3		C289-6
C289-4		C289-6

Is the resistance greater than 10,000 ohms?

Yes

No	REPAIR the affected circuits.

E5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST F: INCORRECT/ERRATIC DIRECTION OF AIRFLOW FROM OUTLETS

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Air distribution door actuator, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B1086:11	Air Distribution Damper Motor: Circuit Short To Ground	This DTC sets when the HVAC control module senses lower than expected voltage on the motor circuits, indicating a short to ground.
HVAC B1086:12	Air Distribution Damper Motor: Circuit Short To Battery	This DTC sets when the HVAC control module senses greater than expected voltage on the motor circuits, indicating a short to voltage.
HVAC B1086:13	Air Distribution Damper Motor: Circuit Open	This DTC sets when the HVAC control module senses no voltage on the motor circuits, indicating an open circuit.
HVAC B11E7:11	Air Distribution Damper Position Sensor: Circuit Short To Ground	The HVAC module senses lower than expected voltage on the feedback potentiometer circuit, indicating a short to ground.
HVAC B11E7:15	Air Distribution Damper Position Sensor: Circuit Short To Battery Or Open	The HVAC module senses greater than expected voltage on the feedback potentiometer circuit, indicating a short to voltage or open circuit.

Possible Sources

Wiring, terminals or connectors
Air distribution door actuator
HVAC control module

Visual Inspection and Pre-checks

Inspect BCM fuse 21 (7.5A).

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

F1 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect Air distribution door actuator C236 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C236-1		Ground
C236-2		Ground
C236-3		Ground
C236-4		Ground
C236-6		Ground

Is there any voltage present?

Yes

REPAIR the circuit in question.

GO to F2

F2 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C236-1		Ground
C236-2		Ground
C236-3		Ground
C236-4		Ground
C236-6		Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to F3

No	REPAIR the circuit in question.

F3 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR AN OPEN

Disconnect HVAC control module C294A .

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C236-1		C294A-20
C236-2		C294A-2
C236-3		C294A-3
C236-4		C294A-22
C236-6		C294A-9

Are the resistances less than 3 ohms?

Yes

GO to F4

No	REPAIR the circuit in question.

F4 CHECK THE AIR DISTRIBUTION DOOR ACTUATOR CIRCUITS FOR A SHORT TOGETHER

Disconnect Temperature door actuator C2092 .

Disconnect Air inlet door actuator C289 .

Disconnect In-vehicle temperature/humidity sensor C233 (all others).

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C236-1		C236-2
C236-1		C236-3
C236-1		C236-4
C236-1		C289-6
C236-2		C236-3
C236-2		C236-4
C236-2		C289-6
C236-3		C236-4
C236-3		C289-6
C236-4		C289-6

Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new air distribution door actuator.
REFER to: Air Distribution Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
Operate the system and determine if the concern is still present. If the concern is still present, GO to F5

No	REPAIR the affected circuits.

F5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST G: INSUFFICIENT, ERRATIC OR NO HEAT

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

When the engine is at operating temperature hot coolant flows from the engine through the heater core and back to the engine. Correct coolant temperatures are critical for good heater performance.

Possible Sources

Low engine coolant level
(If equipped) cabin heater coolant pump
(If equipped) transmission fluid heater coolant control valve
(If equipped) cabin heater coolant diverter valve (PHEV)
Plugged or partially plugged heater core
Temperature binding or stuck
Temperature door actuator

Visual Inspection and Pre-checks

Inspect for low engine coolant level.

G1 CHECK FOR CORRECT ENGINE COOLANT LEVEL

Ignition OFF.

Check the engine coolant level.

Is the engine coolant at the correct level (hot or cold) as indicated on the engine coolant recovery reservoir?

Yes

GO to G3

GO to G2

G2 CHECK THE ENGINE COOLING SYSTEM FOR LEAKS

Pressure test the cooling system for leaks. Refer to the appropriate section in Group 303 for the procedure.

Does the cooling system leak?

Yes

REPAIR the coolant leak.

No	FILL and BLEED the cooling system. Refer to the appropriate section in Group 303 for the procedure. After filling and bleeding the cooling system, GO to G3

G3 CHECK FOR COOLANT FLOW TO THE HEATER CORE

Run the engine until it reaches normal operating temperature.

On the HVAC controls, select the FLOOR position, then set the temperature control to full warm and the blower to the lowest setting.

Using a suitable temperature measuring device, check the temperature of the heater core inlet hose.

Is the heater core inlet hose temperature above 65.5°C (150°F)?

Yes

GO to G4

No	DIAGNOSE the engine does not reach operating temperature. Refer to the appropriate section in Group 303 for the procedure.

G4 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE

Using a suitable temperature measuring device, measure the temperature of the heater core outlet hose.

Is the heater core outlet hose temperature similar to the inlet hose temperature [within approximately 6-17°C (10-30°F)]?

Yes

DIAGNOSE an inoperative temperature door actuator, GO to Pinpoint Test J

GO to G5

G5 CHECK FOR A PLUGGED OR RESTRICTED HEATER CORE RETURN LOOP

INSTALL a temporary bypass hose from the heater core outlet to the thermostat housing assembly (as applicable).

Using a suitable temperature measuring device, measure the heater core inlet and outlet hose temperatures.

Is the heater core outlet hose temperature similar to the inlet hose temperature [within approximately 6-17°C (10-30°F)]?

Yes

There is a restriction in the coolant control valve and/or the hoses.
If equipped with a cabin heater coolant pump, DIAGNOSE for the cabin coolant pump causing a possible restriction of flow to the heater core. Using a suitable temperature measuring device, check the temperature of the coolant hose to the applicable component.
If equipped with a transmission fluid heater coolant control valve, or If equipped with a cabin heater coolant diverter valve (PHEV), DIAGNOSE for the coolant control valve causing a possible restriction of flow to the heater core. Using a suitable temperature measuring device, check the temperature of the coolant hose to the applicable component.
REPAIR or replace components as necessary.

No	INSTALL a new heater core. REFER to: Heater Core (412-00 Climate Control System - General Information, Removal and Installation).

PINPOINT TEST H: THE AIR CONDITIONING (A/C) IS INOPERATIVE WITH NO DIAGNOSTIC TROUBLE CODES (DTCS)

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

When an A/C request is received by the PCM , the A/C clutch is engaged when all of the following conditions are met:

Excessively high or low refrigerant pressure from the A/C pressure transducer is not detected.
Ambient air temperature is above approximately 0°C (32.0°F).
Evaporator temperature is above approximately 1°C (33.8°F).
Engine coolant temperature conditions are within normal parameters.
Wide Open Throttle (WOT) condition is not present.
Engine torque conditions are within normal parameters.
Battery state of charge conditions are within normal parameters.

For more information on A/C Request, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

Possible Sources

Wiring, terminals or connectors
A/C system discharged or low refrigerant charge
Network concerns
A/C pressure transducer
Evaporator temperature sensor
Engine temperature sensors
A/C compressor clutch air gap
A/C compressor clutch field coil
A/C clutch relay
HVAC control module

Visual Inspection and Pre-checks

Inspect for loose or corroded PCM and A/C clutch relay connection
Verify BJB fuses 22 (10A or 5A) and 10 (7.5A) are OK.
Verify the A/C compressor belt is OK.
Verify the A/C compressor clutch is engaged/operating.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

H1 VERIFY THE AIR CONDITIONING (A/C) CLUTCH OPERATION

Start the engine. Observe the outside temperature display for proper operation.

On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

Does the A/C compressor clutch engage?

Yes

TEST the A/C system for normal operation. CARRY OUT the refrigerant system tests. REFER to the appropriate Refrigerant System Tests General Procedure in Group 412-00.

GO to H2

H2 RESET THE AMBIENT AIR TEMPERATURE (AAT) SENSOR

On the HVAC controls, press the A/C (air conditioning) and Recirc buttons simultaneously for 5 seconds, then release both. Within 2 seconds press A/C button again.

Start the engine.

On the HVAC controls, set the temperature to full cold, select PANEL and select the A/C button (indicator on).

Does the A/C compressor turn on?

Yes

TEST the A/C system for normal operation. CARRY OUT the refrigerant system tests. REFER to the appropriate Refrigerant System Tests General Procedure in Group 412-00.

GO to H3

H3 CHECK THE A/C (AIR CONDITIONING) SYSTEM PRESSURE

NOTE: Static refrigerant pressure, under perfect conditions, should approximately reflect ambient air temperature. Do not rely upon the static refrigerant pressure alone to determine if the system is properly charged. Refer to the current Ford Web Based Technical Training courses for basic HVAC system refrigerant operation.

Ignition OFF.

With the manifold gauge set connected, check for minimum A/C system pressure.

Is the A/C system pressure above 290 kPa (42 psi)?

Yes

GO to H4

No	CHECK the A/C system for leaks. REFER to the appropriate Leak Detection General Procedures in Group 412-00. After the leak is repaired, RECHARGE the A/C system. REFER to the appropriate General Procedure in Group 412-00.

H4 CHECK THE COMMUNICATION NETWORK

Ignition ON.

Using a diagnostic scan tool, carry out the network test.

Do the HVAC control module and the PCM pass the network test?

Yes

GO to H5

No	DIAGNOSE the HVAC control module or PCM does not communicate with the diagnostic scan tool.

H5 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) PRESSURE SENSOR (ACP_PRESS) PARAMETER IDENTIFICATION (PID)

NOTE: The following pinpoint test step is tested in ambient temperature of approximately 21.1°C (70°F). As ambient temperatures near 38°C (100.4°F), the pressure value difference increases above ± 15 psi (103 kPa) range.

Ignition ON.

Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

With the manifold gauge set connected, compare the pressure readings of the manifold gauge set and the ACP_PRESS PID .

Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID , dependent upon ambient temperatures, within ± 103 kPa (15 psi)?

Yes

GO to H6

No	DIAGNOSE the A/C pressure transducer. GO to Pinpoint Test A

H6 ELECTRIC COOLING FAN FUNCTIONAL CHECK

Ignition ON.

Using a diagnostic scan tool, carry out the PCM KOEO self-test.

Does the electric cooling fan operate sometime during the KOEO self-test?

Yes

GO to H7

No	DIAGNOSE the electric cooling fan operation. REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual. Section 3 Symptom Charts.

H7 COMPARE THE PCM (POWERTRAIN CONTROL MODULE) INTAKE AIR TEMPERATURE (IAT) PID (PARAMETER IDENTIFICATION) AND THE OTHER TEMPERATURE SENSOR READINGS TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PARAMETER IDENTIFICATION (PID)

NOTE: Compare multiple engine sensor readings to the ambient temperature to determine sensors are reading correctly. A faulty sensor can cause the PCM to disable the A/C with or without a DTC .

Allow the vehicle exterior and interior to stabilize to ambient temperature. This can take a soak period of at least 6 hours.

Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

Monitor the AAT, CACT, CHT, ECT, IAT, IAT2, MAF, MAPT, TCB and TCIPT Parameter Identifications (PIDs) (as applicable).

Are the temperature values similar [typically within 18ºC or 30ºF of each other]?

Yes

GO to H8

No	DIAGNOSE the suspect temperature sensor. REFER to Section 413-01 for Ambient Air Temperature (AAT) sensor or Outside Air Temperature Display concerns. For all other temperature sensor concerns, REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

H8 COMPARE THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE (A/C) EVAPORATOR TEMPERATURE (EVAP_TEMP) PID (PARAMETER IDENTIFICATION) TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PARAMETER IDENTIFICATION (PID)

Ignition OFF.

Allow the vehicle exterior and interior to stabilize to the outside ambient temperature.

Ignition ON.

Using a diagnostic scan tool, view the PCM Parameter Identification (PIDs).

Monitor and record the PCM PID AAT.

Using a diagnostic scan tool, view the HVAC control module Parameter Identification (PIDs).

Monitor and record the HVAC control module PID EVAP_TEMP.

Are the temperature values similar [typically within 18ºC or 30ºF of each other]?

Yes

If equipped with the active grille shutter system, GO to H9
If not equipped with the active grille shutter system, GO to H10

No	DIAGNOSE the evaporator temperature sensor.

H9 VERIFY THE GRILLE SHUTTER OPERATION USING THE PCM (POWERTRAIN CONTROL MODULE) GRILL SHUTTER A POSITION - COMMANDED (GRILL_A_CMD) PARAMETER IDENTIFICATION (PID)

Start the engine and allow it to idle for at least 30 seconds to allow for the grille shutter calibration to complete.

Using a diagnostic scan tool, view PCM PID .

Using a diagnostic scan tool, select the PCM PID GRILL_A_CMD and command the grille shutter from 100% (open) to 0% (closed) while observing the grille shutter operation from the front of the vehicle.

Does the grill shutter fully open and close when commanded by the scan tool?

Yes

GO to H10

No	DIAGNOSE the active grille shutter is inoperative or does not operate correctly. REFER to: Active Grille Shutter (501-02 Front End Body Panels, Diagnosis and Testing).

H10 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE (A/C) SWITCH STATUS (CC_SW_AC) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON

Using a diagnostic scan tool, monitor the HVAC control module CC_SW_AC PID .

Monitor the CC_SW_AC PID .

On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

Does the PID display Active or On when pressed and Inactive or Off when released?

Yes

GO to H11

GO to H18

H11 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON

Start the engine.

Using a diagnostic scan tool, monitor the PCM AC_REQ PID .

On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

Does the PID display ON or Yes when the button is pressed?

Yes

GO to H12

GO to H18

H12 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) COMPRESSOR COMMANDED STATE (ACC_CMD) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) COMMANDED ON

Using a diagnostic scan tool, activate the PCM ACC_CMD PID .

Does the A/C compressor turn on?

Yes

GO to H19

GO to H13

H13 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C100-2 Ground

Is the resistance less than 3 ohms?

Yes

GO to H14

No	REPAIR the circuit.

H14 CHECK THE VOLTAGE TO THE A/C (AIR CONDITIONING) CLUTCH RELAY

Disconnect Air Conditioning (A/C) clutch relay.

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
A/C clutch relay socket 1 (component side)		Ground
A/C clutch relay socket 3 (component side)		Ground

Are the voltages greater than 11 volts?

Yes

GO to H15

No	VERIFY BJB fuse 22 (10A or 5A) and 10 (7.5A) are OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

H15 BYPASS THE A/C (AIR CONDITIONING) CLUTCH RELAY

Ignition OFF.

Connect a fused jumper wire:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
A/C clutch relay socket 3 (component side)		A/C clutch relay socket 5 (component side)

Does the A/C compressor clutch engage?

Yes

REMOVE the fused jumper wire. INSTALL a new A/C clutch relay.

No	LEAVE the fused jumper wire installed. GO to H16

H16 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Disconnect Air Conditioning (A/C) compressor clutch field coil C100 .

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C100-1 Ground

Is the voltage greater than 11 volts?

Yes

REMOVE the fused jumper wire. GO to H17

No	REMOVE the fused jumper wire. REPAIR the circuit.

H17 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH AIR GAP

Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley.
REFER to: Air Conditioning (A/C) Clutch Air Gap Adjustment (412-00 Climate Control System - General Information, General Procedures).

Is the A/C compressor clutch air gap greater than 0.6 mm (0.0236 in)?

Yes

ADJUST the A/C compressor clutch air gap.
REFER to: Air Conditioning (A/C) Clutch Air Gap Adjustment (412-00 Climate Control System - General Information, General Procedures).

No	INSTALL a new A/C clutch and A/C clutch field coil. REFER to: Air Conditioning (A/C) Clutch and Air Conditioning (A/C) Clutch Field Coil (412-00 Climate Control System - General Information, General Procedures).

H18 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC control module.
REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module (412-00 Climate Control System - General Information, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

H19 CHECK FOR AN INPUT DISABLING THE A/C (AIR CONDITIONING) CLUTCH RELAY

NOTE: Powertrain Control Module (PCM) strategy may disable Air Conditioning (A/C) compressor operation. If the Air Conditioning (A/C) compressor clutch can be commanded on using a diagnostic scan tool PCM PIDS Active Commands, Powertrain Control Module (PCM) replacement does not resolve the condition.

NOTE: On some engines, Powertrain Control Module (PCM) AC_INHIBIT Parameter Identifications (PIDs) can be used to diagnose why the A/C clutch is not energizing. If AC_INHIBIT PIDS are Not available, follow the information below.

Diagnose the PCM not energizing the A/C clutch relay using the suggestions in the table below.

A/C Clutch Engagement is inhibited because strategy has not yet detected hardware that indicates vehicle is equipped with A/C

A/C Clutch Engagement is inhibited because the strategy is operating in Ignition System Failure Mode

A/C Clutch Engagement is inhibited because the (ECU) received a Request to Command the A/C Off

A/C Clutch Engagement is inhibited because the engine has not yet reached a stable running mode after starting

A/C Clutch Engagement is inhibited because the A/C Discharge (Head) Pressure is Too High

A/C Clutch Engagement is inhibited because the Engine Coolant Temperature is Too High

A/C Clutch Engagement is inhibited to Prevent Frost and Ice Build Up on the Evaporator

A/C Clutch Engagement is inhibited to Prevent an Engine Stall during a Low Engine Speed condition

A/C Clutch Engagement is inhibited to Protect the Compressor from a Compressor Over-speed condition

A/C Clutch Engagement is inhibited to temporarily make more power available when Accelerator Pedal is Fully Depressed

A/C Clutch Engagement is inhibited because Low A/C Refrigerant Charge has been detected

A/C Clutch Engagement is inhibited to Protect the Compressor from Operating at Too Low of an Ambient Temperature

A/C Clutch Engagement is inhibited due to Missing Climate Control Message

A/C Clutch Engagement is inhibited because the strategy is operating in Failsafe Cooling Mode

A/C Clutch Engagement is inhibited to Protect the Clutch from Damage because the Compressor Load and Speed are Too High

A/C Clutch Engagement is inhibited by the off portion of the A/C Cycling Strategy invoked to manage High Engine Temperature

A/C Clutch Engagement is inhibited due to Low Battery State of Charge

A/C Clutch Engagement is inhibited to Protect the Variable Displacement Compressor from Operating at Too Low of a Temperature

A/C Clutch Engagement is inhibited to improve Brake Booster Vacuum

A/C Clutch Engagement is inhibited because Evaporator Temperature is sufficiently low and compressor was at minimum displacement

A/C Clutch Engagement is inhibited (Disabled) because the Evaporator Temperature is sufficiently below the target temperature

A/C Clutch Engagement is inhibited to satisfy A/C Clutch minimum off time

A/C Clutch Engagement is inhibited Due to Request from Torque Control Strategy (to Temporarily Make More Power Available)

A/C Clutch Engagement is inhibited to Prevent Engine Stalling

A/C Clutch Engagement is inhibited Due to Request to Disable A/C from Stop-Start Strategy

A/C Clutch Engagement is inhibited (Delayed) to make Power Available for Power Steering

A/C Clutch Engagement Is Inhibited Due To State Of Auxiliary A/C Disable (Typically A Pressure Or Temperature) Switch 1 input

A/C Clutch Engagement is inhibited due to state of auxiliary A/C Disable (Typically a Pressure or Temperature) Switch 2 input

Are any of the conditions described above not within normal parameters?

Yes

DIAGNOSE the condition found to be disabling the A/C clutch relay. REFER to the appropriate 303 Workshop Manual (WSM) Diagnosis and Testing section or the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

The A/C compressor clutch can be commanded on using a diagnostic scan tool PCM Active command PID . The A/C inoperative concern may be caused by an intermittent condition do to a component or module connection, wiring or pin issue. ADDRESS the root cause of any connector or pin issues. CHECK the vehicle service history for recent service actions that have replaced modules. This condition may be due to incomplete or incorrect PMI procedures.

PINPOINT TEST I: THE A/C (AIR CONDITIONING) IS ALWAYS ON - A/C (AIR CONDITIONING) MODE ALWAYS COMMANDED ON

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Control System Logic, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P1464:00	A/C Demand Out Of Self Test Range: No Sub Type Information	This DTC sets when the PCM senses an A/C request when performing a self-test.

Possible Sources

Wiring, terminals or connectors
PCM
HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

I1 RECHECK THE PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

Ignition ON.

Make sure the HVAC control module is powered off.

Using a diagnostic scan tool, clear the PCM Diagnostic Trouble Codes (DTCs).

Using a diagnostic scan tool, carry out the PCM KOEO self-test.

Does DTC P1464 return?

Yes

GO to I2

No	IGNORE the DTC and CONTINUE diagnosing other Diagnostic Trouble Codes (DTCs) or symptoms. GO to the DTC Chart: PCM or Symptom Chart – Climate Control in this section.

I2 CHECK THE A/C (AIR CONDITIONING) CLUTCH RELAY

Carry out the component test on the A/C clutch relay.
Refer to Wiring Diagrams Cell 149 for schematic and connector information.

Did the relay pass the component test?

Yes

GO to I3

No	INSTALL a new A/C clutch relay.

I3 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect A/C compressor clutch field coil C100.

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C100-1 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to I4

I4 COMPARE THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE (A/C) EVAPORATOR TEMPERATURE (EVAP_TEMP) PID (PARAMETER IDENTIFICATION) TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PID (PARAMETER IDENTIFICATION)

Ignition OFF.

Allow the vehicle exterior and interior to stabilize to the outside ambient temperature.

Ignition ON.

Using a diagnostic scan tool, view the PCM Parameter Identification (PIDs).

Monitor and record the PCM PID AAT.

Using a diagnostic scan tool, view the HVAC control module Parameter Identification (PIDs).

Monitor and record the HVAC control module PID EVAP_TEMP.

Are the temperature values similar [typically within 18ºC or 30ºF of each other]?

Yes

GO to I5

No	DIAGNOSE the evaporator temperature sensor. GO to Pinpoint Test M

I5 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE (A/C) SWITCH STATUS (CC_SW_AC) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON

Ignition ON.

Using a diagnostic scan tool, monitor the HVAC control module CC_SW_AC PID .

Monitor the CC_SW_AC PID .

On the HVAC controls, select PANEL and then press the A/C button (indicator ON).

Does the PID display Active or On when pressed and Inactive or Off when released?

Yes

GO to I6

GO to I9

I6 CHECK THE A/C (AIR CONDITIONING) PRESSURE SENSOR (ACP_PRESS) PARAMETER IDENTIFICATION (PID)

Using a diagnostic scan tool, view the PCM Parameter Identification (PIDs).

With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM Parameter Identification (PID) ACP_PRESS.

Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID within ± 103 kPa (15 psi)?

Yes

GO to I7

No	DIAGNOSE the A/C pressure transducer. GO to Pinpoint Test A

I7 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) OFF

Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

Monitor the AC_REQ PID .

While in panel mode, release the A/C button (indicator off) on the HVAC controls.

Does the PID display No or OFF?

Yes

GO to I10

GO to I8

I8 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE DISCONNECTED

Ignition OFF.

Disconnect HVAC control module C228A .

Ignition ON.

Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

Monitor the AC_REQ PID .

Does the PID display No or OFF?

Yes

GO to I10

GO to I9

I9 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

I10 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect all PCM connectors. Make sure they seat and latch correctly.

Operate the system and verify the concern is still present.

Is the concern still present?

Yes

Click here to access Guided Routine (PCM).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST J: TEMPERATURE CONTROL IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Temperature Door Actuator, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B1081:11	Left Temperature Damper Motor: Circuit Short To Ground	The HVAC module senses lower than expected voltage on the motor circuits, indicating a short to ground.
HVAC B1081:12	Left Temperature Damper Motor: Circuit Short To Battery	The HVAC module senses greater than expected voltage on the motor circuits, indicating a short to voltage.
HVAC B1081:13	Left Temperature Damper Motor: Circuit Open	This DTC sets when the HVAC control module senses no voltage on the actuator motor circuit when ground is applied to drive the motor, indicating a open circuit.
HVAC B11E5:11	Left HVAC Damper Position Sensor: Circuit Short To Ground	The HVAC module senses lower than expected voltage on the feedback potentiometer circuit, indicating a short to ground.
HVAC B11E5:15	Left HVAC Damper Position Sensor: Circuit Short To Battery Or Open	The HVAC module senses greater than expected voltage on the feedback potentiometer circuit, indicating a short to voltage or open circuit.

Possible Sources

Wiring, terminals or connectors
Temperature door actuator
HVAC control module

Visual Inspection and Pre-checks

Inspect BCM fuse 21 (7.5A).

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

J1 CHECK THE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect Temperature door actuator C2092 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2092-1		Ground
C2092-2		Ground
C2092-3		Ground
C2092-4		Ground
C2092-6		Ground

Is there any voltage present?

Yes

REPAIR the circuit in question.

GO to J2

J2 CHECK THE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2092-1		Ground
C2092-2		Ground
C2092-3		Ground
C2092-4		Ground
C2092-6		Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to J3

No	REPAIR the circuit in question.

J3 CHECK THE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR AN OPEN

Disconnect HVAC control module C294A and C294B .

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2092-1		C294A-8
C2092-2		C294A-2
C2092-3		C294A-3
C2092-4		C294A-10
C2092-6		C294A-9

Are the resistances less than 3 ohms?

Yes

GO to J4

No	REPAIR the circuit in question.

J4 CHECK THE TEMPERATURE DOOR ACTUATOR CIRCUITS FOR A SHORT TOGETHER

Disconnect Air distribution door actuator C236 .

Disconnect Air inlet door actuator C289 .

Disconnect In-vehicle temperature/humidity sensor C2247 .

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2092-1		C2092-2
C2092-1		C2092-3
C2092-1		C2092-4
C2092-1		C2092-6
C2092-2		C2092-3
C2092-2		C2092-4
C2092-2		C2092-6
C2092-3		C2092-4
C2092-3		C2092-6
C2092-4		C2092-6

Are the resistances less than 3 ohms?

Yes

INSTALL a new temperature door actuator.
REFER to: Temperature Door Actuator (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to J5

No	REPAIR the circuit in question.

J5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST K: THE BLOWER MOTOR IS INOPERATIVE

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Air Handling, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B10AF:11	Blower Fan Relay: Circuit Short To Ground	This DTC sets when the HVAC control module senses no voltage change on the blower motor relay coil control circuit when the module attempts to engage the relay, indicating a short directly to ground. The blower motor is inoperative.
HVAC B10AF:15	Blower Fan Relay: Circuit Short To Battery Or Open	This DTC sets when the HVAC control module senses no ground on the blower motor relay coil control circuit when the module attempts to engage the relay, indicating an open circuit or a short directly to voltage. The blower motor is inoperative when the relay control circuit is open. The blower motor is always on when the relay control circuit is shorted to voltage.
HVAC B10B9:12	Blower Control: Circuit Short To Battery	This DTC sets when the HVAC control module senses excessive voltage on the blower motor speed control PWM circuit, indicating a short directly to voltage. The blower motor is inoperative.
HVAC B10B9:14	Blower Control: Circuit Short To Ground Or Open	This DTC sets when the HVAC control module senses no voltage on the blower motor speed control PWM circuit, indicating an open or a short directly to ground. The blower motor is inoperative.

Possible Sources

Wiring, terminals or connectors
Blower motor relay
Blower motor
Blower motor speed control
HVAC control module

Visual Inspection and Pre-checks

Inspect BJB fuse 6 (40A).

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

K1 CHECK THE BLOWER MOTOR RELAY FUNCTIONALITY

Ignition OFF.

Disconnect Blower motor relay.

Carry out the component test on the blower motor relay.
Refer to Wiring Diagrams Cell 149 for schematic and connector information.

Did the relay pass the component test?

Yes

GO to K2

No	INSTALL a new blower motor relay.

K2 CHECK THE BLOWER MOTOR RELAY COIL GROUND CIRCUIT FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Blower motor relay socket 2 Ground

Is the resistance less than 3 ohms?

Yes

GO to K3

No	REPAIR the circuit.

K3 CHECK THE BLOWER MOTOR RELAY SWITCH CONTACT SUPPLY VOLTAGE

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Blower motor relay socket 3 Ground

Is the voltage greater than 11 volts?

Yes

GO to K4

No	VERIFY BJB fuse 6 (40A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

K4 CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR A SHORT TO GROUND

Disconnect HVAC control module C294A .

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Blower motor relay socket 1 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to K5

No	REPAIR the circuit.

K5 CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Blower motor relay socket 1 C294A-11

Is the resistance less than 3 ohms?

Yes

GO to K6

No	REPAIR the circuit.

K6 CHECK THE BLOWER MOTOR SPEED CONTROL VOLTAGE CIRCUIT FOR AN OPEN

Disconnect Blower motor speed control C297A .

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Blower motor relay socket 5 C297A-4

Is the resistance less than 3 ohms?

Yes

GO to K7

No	REPAIR the circuit.

K7 CHECK THE BLOWER MOTOR SPEED CONTROL GROUND CIRCUIT FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C297A-2 Ground

Is the resistance less than 3 ohms?

Yes

GO to K8

No	REPAIR the circuit.

K8 CHECK THE BLOWER MOTOR SPEED CONTROL PWM (PULSE WIDTH MODULATION) CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C297A-3 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to K9

K9 CHECK THE BLOWER MOTOR SPEED CONTROL PWM (PULSE WIDTH MODULATION) CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C297A-3 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to K10

No	REPAIR the circuit.

K10 CHECK THE BLOWER MOTOR SPEED CONTROL PWM (PULSE WIDTH MODULATION) CIRCUIT FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C297A-3 C294A-23

Is the resistance less than 3 ohms?

Yes

GO to K11

No	REPAIR the circuit.

K11 CHECK THE OUTPUTS TO THE BLOWER MOTOR

Disconnect Blower motor C2004 .

Connect Blower motor relay.

Connect Blower motor speed control C297A .

Connect HVAC control module C294A .

Ignition ON.

Select PANEL on the HVAC controls.

Select the highest blower motor setting.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2004-1 C2004-2

Is the voltage greater than 11 volts?

Yes

INSTALL a new blower motor.
REFER to: Blower Motor (412-00 Climate Control System - General Information, Removal and Installation).

GO to K12

K12 CHECK THE CIRCUITS TO THE BLOWER MOTOR FOR AN OPEN

Ignition OFF.

Disconnect Blower motor speed control C297B .

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C297B-1 C2004-1

C297B-2 C2004-2

Are the resistances less than 3 ohms?

Yes

GO to K13

No	REPAIR the circuit in question.

K13 CHECK THE BLOWER MOTOR CIRCUITS FOR A SHORT TOGETHER

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C297B-1 C297B-2

Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new blower motor speed control.
REFER to: Blower Motor Speed Control (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to K14

No	REPAIR the circuits.

K14 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST L: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Air handling, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B10AF:15	Blower Fan Relay: Circuit Short To Battery Or Open	This DTC sets when the HVAC control module senses no ground on the blower motor relay coil control circuit when the module attempts to engage the relay, indicating an open circuit or a short directly to voltage. The blower motor is inoperative when the relay control circuit is open. The blower motor is always on when the relay control circuit is shorted to voltage.

Possible Sources

Wiring, terminals or connectors
Blower motor relay
Blower motor
Blower motor speed control
HVAC control module

Visual Inspection and Pre-checks

Inspect for loose connections at blower motor speed control.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

L1 VERIFY THE BLOWER MOTOR OPERATION

Ignition ON.

Select panel on the HVAC controls. Adjust the blower motor setting to the minimum and maximum settings.

Does the blower motor operate at any setting?

Yes

GO to L2

No	GO to Pinpoint Test K

L2 CHECK THE BLOWER MOTOR RELAY

Ignition OFF.

Disconnect Blower motor relay.

Carry out the blower motor relay component test.
Refer to Wiring Diagrams Cell 149 for schematic and connector information.

Does the relay pass the component test?

Yes

GO to L3

No	INSTALL a new blower motor relay.

L3 CHECK THE BLOWER MOTOR RELAY COIL CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect HVAC control module C294A .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Blower motor relay socket 1 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to L4

L4 CHECK THE BLOWER MOTOR SPEED CONTROL VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Blower motor relay socket 5 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to L5

L5 CHECK FOR CORRECT BLOWER MOTOR SPEED CONTROL OPERATION

Ignition OFF.

Disconnect and inspect all the blower motor speed control connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the blower motor speed control connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

L6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST M: B1B71:11, B1B71:15

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The evaporator temperature sensor, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B1B71:11	Evaporator Temperature Sensor: Circuit Short To Ground	The HVAC control module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground.
HVAC B1B71:15	Evaporator Temperature Sensor: Circuit Short To Battery Or Open	The HVAC control module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage, an open circuit or sensor.

Possible Sources

Wiring, terminals or connectors
Evaporator temperature sensor
HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

M1 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C294A .

Disconnect Evaporator temperature sensor C296 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C296-1 Ground

C296-2 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to M2

M2 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C296-1 Ground

C296-2 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to M3

No	REPAIR the circuit.

M3 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C296-1 C294A-19

C296-2 C294A-2

Is the resistance less than 3 ohms?

Yes

GO to M4

No	REPAIR the circuit.

M4 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C296-1 C296-2

Is the resistance less than 10,000 ohms?

Yes

INSTALL a new evaporator temperature sensor.
REFER to: Evaporator Temperature Sensor (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to M5

No	REPAIR the circuits.

M5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST N: B105A:12, B105A:14, B1A61:11, B1A61:15, B1A69:11, B1A69:15, B1A69:92

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The in-vehicle temperature and humidity sensor (if equipped) contains a thermistor and a sensing element which separately measures the in-vehicle air temperature and the humidity, then sends those readings to the HVAC control module. The in-vehicle temperature and humidity sensor has an electric fan within the sensor that draws in-vehicle air across the two sensing elements. The HVAC control module may adjust the air inlet door based on the in-vehicle temperature and humidity sensor information to maintain the desired humidity of the passenger cabin air.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B105A:12	Cabin Temperature Sensor Fan: Circuit Short To Battery	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses unexpected voltage on the circuit for the cabin temperature sensor fan.
HVAC B105A:14	Cabin Temperature Sensor Fan: Circuit Short To Ground Or Open	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses no voltage or unexpected voltage on the circuit for the cabin temperature sensor fan.
HVAC B1A61:11	Cabin Temperature Sensor: Circuit Short To Ground	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the cabin temperature sensor circuit.
HVAC B1A61:15	Cabin Temperature Sensor: Circuit Short To Battery Or Open	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses no voltage or unexpected voltage on the circuit for the cabin temperature sensor.
HVAC B1A69:11	Humidity Sensor: Circuit Short To Ground	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the humidity sensor circuit.
HVAC B1A69:15	Humidity Sensor: Circuit Short To Battery Or Open	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the humidity sensor circuit.
HVAC B1A69:92	Humidity Sensor: Performance Or Incorrect Operation	This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic responses from the humidity sensor circuit.

Possible Sources

Fuse
Wiring, terminals or connectors
In-vehicle temperature and humidity sensor
HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

N1 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect In-vehicle temperature sensor C2247 .

Disconnect BCM fuse 2 (5A).

Disconnect HVAC control module C294A and C294B .

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2247-1		Ground
C2247-2		Ground
C2247-3		Ground
C2247-4		Ground
C2247-5		Ground
C2247-6		Ground

Is any voltage present?

Yes

REPAIR the circuit in question.

GO to N2

N2 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2247-1		Ground
C2247-2		Ground
C2247-3		Ground
C2247-4		Ground
C2247-5		Ground
C2247-6		Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to N3

No	REPAIR the circuit in question.

N3 CHECK THE IN-VEHICLE TEMPERATURE AND HUMIDITY SENSOR CIRCUITS FOR AN OPEN CIRCUIT

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2247-1		C294B-27
C2247-2		C294B-29
C2247-4		C294B-19

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2247-3		C294A-3
C2247-5		C294A-2

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C2247-6		BCM fuse 2 (5A)

Are the resistances less than 3 ohms?

Yes

INSTALL a new in-vehicle temperature sensor.
REFER to: In-Vehicle Temperature Sensor (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to N4

No	REPAIR the circuit in question.

N4 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST O: B1A63:11, B1A63:15, B1A64:11, B1A64:15

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Sunload sensor, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B1A63:11	Right Solar Sensor: Circuit Short To Ground	This DTC sets when the HVAC module senses lower than expected voltage on the RH sensor feedback circuit, indicating a short to ground.
HVAC B1A63:15	Right Solar Sensor: Circuit Short To Battery Or Open	This DTC sets when the HVAC module senses greater than expected voltage on the RH sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.
HVAC B1A64:11	Left Solar Sensor: Circuit Short To Ground	This DTC sets when the HVAC module senses lower than expected voltage on the LH sensor feedback circuit, indicating a short to ground.
HVAC B1A64:15	Left Solar Sensor: Circuit Short To Battery Or Open	This DTC sets when the HVAC module senses greater than expected voltage on the LH sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.

Possible Sources

Wiring, terminals or connectors
Sunload sensor
HVAC control module

Visual Inspection and Pre-checks

Inspect loose or corroded HVAC module and sunload sensor connections.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

O1 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C294A and C294B .

Disconnect Sunload sensor C286 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C286-1		Ground
C286-2		Ground
C286-3		Ground
C286-4		Ground
C286-5		Ground

Is any voltage present?

Yes

REPAIR the affected circuits.

GO to O2

O2 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C286-1		Ground
C286-2		Ground
C286-3		Ground
C286-4		Ground
C286-5		Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to O3

No	REPAIR the affected circuits.

O3 CHECK THE SUNLOAD SENSOR CIRCUITS FOR AN OPEN

Disconnect BCM C2280D .

Measure:
Click to display connectors
Without RHD base

Positive Lead Measurement / Action Negative Lead

C286-1 C294B-21

C286-2 C294B-22

Click to display connectors
RHD base

Positive Lead Measurement / Action Negative Lead

C286-1 C294B-17

C286-2 C294B-18

Click to display connectors

Positive Lead Measurement / Action Negative Lead

C286-3 C294A-2

Click to display connectors

Positive Lead Measurement / Action Negative Lead

C286-4 C2280D-52

C286-5 C2280D-39

Are the resistances less than 3 ohms?

Yes

GO to O4

No	REPAIR the affected circuits.

O4 CHECK THE SUNLOAD SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C286-1		C286-2
C286-1		C286-3
C286-1		C286-4
C286-1		C286-5
C286-2		C286-3
C286-2		C286-4
C286-2		C286-5
C286-3		C286-4
C286-3		C286-5
C286-4		C286-5

Are the resistances greater than 10,000 ohms?

Yes

GO to O5

No	REPAIR the circuits.

O5 CHECK FOR CORRECT SUNLOAD SENSOR OPERATION

Ignition OFF.

Inspect the disconnected connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect all disconnected connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

INSTALL a new sunload sensor.
REFER to: Sunload Sensor (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to O6

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

O6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST P: B10B5:11, B10B5:15

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Sensor inputs, center register air discharge temperature sensor, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B10B5:11	Left Panel Air Discharge Temperature: Circuit Short To Ground	This DTC sets when the HVAC module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground.
HVAC B10B5:15	Left Panel Air Discharge Temperature: Circuit Short To Battery Or Open	This DTC sets when the HVAC module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.

Possible Sources

Wiring, terminals or connectors
Center register air discharge temperature sensor
HVAC control module

Visual Inspection and Pre-checks

Inspect loose or corroded HVAC control module and center register air discharge temperature sensor connections.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

P1 CHECK THE CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C294A and C294B .

Disconnect Center register air discharge temperature sensor C2438 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2438-1 Ground

C2438-2 Ground

Is any voltage present?

Yes

REPAIR the affected circuits.

GO to P2

P2 CHECK THE CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2438-1 Ground

C2438-2 Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to P3

No	REPAIR the affected circuits.

P3 CHECK THE CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2438-1 C294B-5

Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2438-2 C294A-2

Are the resistances less than 3 ohms?

Yes

GO to P4

No	REPAIR the affected circuits.

P4 CHECK THE CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2438-1 C2438-2

Is the resistance greater than 10,000 ohms?

Yes

GO to P5

No	REPAIR the circuits.

P5 CHECK FOR CORRECT CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR OPERATION

Ignition OFF.

Inspect the disconnected connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect all disconnected connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

INSTALL a new center register air discharge temperature sensor.
REFER to: Center Register Air Discharge Temperature Sensor (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to P6

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

P6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST Q: B10B6:11, B10B6:15

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Sensor inputs, footwell air discharge temperature sensor, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B10B6:11	Left Floor Air Discharge Temperature: Circuit Short To Ground	This DTC sets when the HVAC module senses lower than expected voltage on the LH sensor feedback circuit, indicating a short to ground.
HVAC B10B6:15	Left Floor Air Discharge Temperature: Circuit Short To Battery Or Open	This DTC sets when the HVAC module senses greater than expected voltage on the LH sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.

Possible Sources

Wiring, terminals or connectors
Footwell air discharge temperature sensor
HVAC control module

Visual Inspection and Pre-checks

Inspect loose or corroded HVAC control module and footwell air discharge temperature sensor connections.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Q1 CHECK THE FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C294A and C294B .

Disconnect Footwell air discharge temperature sensor C2439 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2439-1 Ground

C2439-2 Ground

Is any voltage present?

Yes

REPAIR the affected circuits.

GO to Q2

Q2 CHECK THE FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2439-1 Ground

C2439-2 Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to Q3

No	REPAIR the affected circuits.

Q3 CHECK THE FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2439-1 C294B-4

Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2439-2 C294A-2

Are the resistances less than 3 ohms?

Yes

GO to Q4

No	REPAIR the affected circuits.

Q4 CHECK THE FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2439-1 C2439-2

Is the resistance greater than 10,000 ohms?

Yes

GO to Q5

No	REPAIR the circuits.

Q5 CHECK FOR CORRECT FOOTWELL AIR DISCHARGE TEMPERATURE SENSOR OPERATION

Ignition OFF.

Inspect the disconnected connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect all disconnected connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

INSTALL a new footwell air discharge temperature sensor.
REFER to: Footwell Air Discharge Temperature Sensor (412-00 Climate Control System - General Information, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to Q6

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

Q6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST R: U0140:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The HVAC uses information contained in messages from the BCM sent on the HS-CAN1 for 5 seconds.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC U0140:00	Lost Communication With Body Control Module: No Sub Type Information	This DTC sets in the HVAC module if data messages received from the BCM are missing.

Possible Sources

Vehicle communication bus
BCM
HVAC control module

R1 CHECK THE COMMUNICATION NETWORK

Ignition ON.

Using a diagnostic scan tool, perform a network test.

Does the BCM pass the network test?

Yes

GO to R2

No	DIAGNOSE the no communication with the BCM .

R2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE BODY CONTROL MODULE (BCM) SELF-TEST

Using a diagnostic scan tool, perform BCM self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes

DIAGNOSE the battery voltage Diagnostic Trouble Codes (DTCs).
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Diagnosis and Testing).

GO to R3

R3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) CONTROL MODULE SELF-TEST

Check for recorded Diagnostic Trouble Codes (DTCs) from the HVAC module self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes

GO to Pinpoint Test U

GO to R4

R4 RECHECK THE HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

Clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Repeat the HVAC module self-test.

Is DTC U0140:00 retrieved again?

Yes

GO to R5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

R5 CHECK FOR DIAGNOSTIC TROUBLE CODE (DTC) U0140:00 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Wait 10 seconds.

Ignition ON.

Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Is DTC U0140:00 set in any other modules?

Yes

GO to R6

GO to R7

R6 CHECK FOR CORRECT BODY CONTROL MODULE (BCM) OPERATION

Ignition OFF.

Disconnect and inspect all BCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect the BCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

R7 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST S: U0151:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The HVAC uses information contained in messages from the RCM sent on the HS-CAN2 for 5 seconds.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC U0151:00	Lost Communication With Restraints Control Module: No Sub Type Information	This DTC sets in the HVAC module if data messages received from the RCM are missing.

Possible Sources

Vehicle communication bus
RCM
HVAC control module

S1 CHECK THE COMMUNICATION NETWORK

Ignition ON.

Using a diagnostic scan tool, perform network test.

Does the RCM pass the network test?

Yes

GO to S2

S2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE RCM (RESTRAINTS CONTROL MODULE) SELF-TEST

Using a diagnostic scan tool, perform RCM self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes

DIAGNOSE the battery voltage Diagnostic Trouble Codes (DTCs).
REFER to: Airbag Supplemental Restraint System (SRS) - Vehicles Without: Rear Seat Side Airbag (501-20B Supplemental Restraint System, Diagnosis and Testing).

GO to S3

S3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) CONTROL MODULE SELF-TEST

Check for recorded Diagnostic Trouble Codes (DTCs) from the HVAC module self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes

GO to Pinpoint Test U

GO to S4

S4 RECHECK THE HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

Clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Repeat the HVAC module self-test.

Is DTC U0151:00 retrieved again?

Yes

GO to S5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

S5 CHECK FOR DIAGNOSTIC TROUBLE CODE (DTC) U0151:00 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Wait 10 seconds.

Ignition ON.

Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Is DTC U0151:00 set in any other modules?

Yes

GO to S6

GO to S7

S6 CHECK FOR CORRECT RCM (RESTRAINTS CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the RCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect theRCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new RCM .
REFER to: Restraints Control Module (RCM) (501-20B Supplemental Restraint System, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

S7 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST T: U0155:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The HVAC uses information contained in messages from the IPC sent on the HS-CAN3 for 5 seconds.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC U0155:00	Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information	This DTC sets in the HVAC module if data messages received from the IPC module are missing.

Possible Sources

Vehicle communication bus
IPC
HVAC module

T1 CHECK THE COMMUNICATION NETWORK

Ignition ON.

Using a diagnostic scan tool, perform network test.

Does the IPC pass the network test?

Yes

GO to T2

T2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE INSTRUMENT PANEL CLUSTER (IPC) SELF-TEST

Using a diagnostic scan tool, perform IPC self-test.

Check for Diagnostic Trouble Codes (DTCs) from the IPC self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes

DIAGNOSE the battery voltage Diagnostic Trouble Codes (DTCs).
REFER to: Instrumentation, Message Center and Warning Chimes (413-01 Instrumentation, Message Center and Warning Chimes) .

GO to T3

T3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) CONTROL MODULE SELF-TEST

Check for recorded Diagnostic Trouble Codes (DTCs) from the HVAC module self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes

GO to Pinpoint Test U

GO to T4

T4 RECHECK THE HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

Clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Repeat the HVAC module self-test.

Is DTC U0155:00 retrieved again?

Yes

GO to T5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

T5 CHECK FOR DIAGNOSTIC TROUBLE CODE (DTC) U0155:00 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Wait 10 seconds.

Ignition ON.

Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Is DTC U0155:00 set in any other modules?

Yes

GO to T6

GO to T7

T6 CHECK FOR CORRECT INSTRUMENT PANEL CLUSTER (IPC) OPERATION

Ignition OFF.

Disconnect and inspect the IPC connector.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect theIPC connector. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new IPC .
REFER to: Instrument Panel Cluster (IPC) (413-01 Instrumentation, Message Center and Warning Chimes, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

T7 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST U: U3003:16, U3003:17

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The HVAC control module is supplied constant voltage and ground. Excessive resistance or an open in one or more of these circuits, a discharged battery or an inoperative charging system results in the HVAC control module setting a DTC .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC U3003:16	Battery Voltage: Circuit Voltage Below Threshold	This DTC sets when the HVAC control module senses lower than expected system voltage.
HVAC U3003:17	Battery Voltage: Circuit Voltage Above Threshold	This DTC sets when the HVAC control module senses greater than expected system voltage. This DTC may also set in the HVAC control module due to battery charging or vehicle jump starting events.

Possible Sources

Fuses
Wiring, terminals or connectors
Charging system concern
Battery
HVAC control module

Visual Inspection and Pre-checks

Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.
Make sure the vehicle battery terminals are tightened to their correct torque specifications.
Make sure BCM fuse 21 (7.5A) is OK.
Inspect for loose or corroded HVAC control module connections.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

U1 CARRY OUT THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE SELF-TEST

Start the engine.

Using a diagnostic scan tool, carry out the HVAC control module self-test.

Using a diagnostic scan tool, clear the HVAC control module Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Wait 10 seconds.

Start the engine.

Using a diagnostic scan tool, carry out the HVAC control module self-test.

Is DTC U3003:16 or U3003:17 still present?

Yes

GO to U2

No	The system is operating normally at this time. The DTC may have been set previously during battery charging or while jump starting the vehicle.

U2 CHECK FOR CHARGING SYSTEM DIAGNOSTIC TROUBLE CODES (DTCS) IN THE PCM (POWERTRAIN CONTROL MODULE)

Ignition OFF.

Ignition ON.

Using a diagnostic scan tool, carry out the PCM KOEO self-test.

Are any charging system Diagnostic Trouble Codes (DTCs) present in the PCM ?

Yes

DIAGNOSE the charging system.
REFER to: Charging System (414-00 Charging System - General Information, Diagnosis and Testing).

GO to U3

U3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE

Carry out the Battery Condition Test diagnostic routine.
REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).

Did the battery pass the condition test?

Yes

GO to U4

No	INSTALL a new battery. REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation).

U4 CHECK THE CHARGING SYSTEM VOLTAGE

NOTE: Do not allow the engine Revolutions Per Minute (RPM) to exceed 2,000 Revolutions Per Minute (RPM) while carrying out this step or the generator may self-excite, resulting in default charging system output voltage. If engine Revolutions Per Minute (RPM) exceeds 2,000 Revolutions Per Minute (RPM), shut the vehicle off and restart the engine before carrying out this step.

Start the engine.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

For DTC U3003:16, turn the headlights on, set the HVAC fan on high and run engine at 1,500 Revolutions Per Minute (RPM) for a minimum of 2 minutes.

For DTC U3003:17, turn off all accessories and run the engine at 1,500 Revolutions Per Minute (RPM) for a minimum of 2 minutes.

Is the battery voltage between 13-15.2 volts?

Yes

For DTC U3003:16, GO to U5
For DTC U3003:17, GO to U7

No	DIAGNOSE the charging system. REFER to: Charging System (414-00 Charging System - General Information, Diagnosis and Testing).

U5 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE VOLTAGE SUPPLY CIRCUIT FOR HIGH RESISTANCE

Ignition OFF.

Disconnect HVAC control module C294A

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294A-26 Ground

Is the voltage greater than 11 volts?

Yes

GO to U6

No	VERIFY the BCM fuse 21 (7.5A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

U6 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE GROUND CIRCUIT FOR HIGH RESISTANCE

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294A-1 Ground

Is the resistance less than 3 ohms?

Yes

GO to U7

No	REPAIR the circuit.

U7 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST V: B102E:11, B102E:15, B102E:92

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

Ambient air quality sensor (if equipped), REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B102E:11	Air Quality Sensor: Circuit Short To Ground	This DTC sets when the HVAC control module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground.
HVAC B102E:15	Air Quality Sensor: Circuit Short To Battery Or Open	This DTC sets when the HVAC control module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.
HVAC B102E:92	Air Quality Sensor: Performance Or Incorrect Operation	This DTC sets when the HVAC control module senses erratic voltages from the evaporator temperature sensor.

Possible Sources

Wiring, terminals or connectors
Ambient air quality sensor
HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

V1 CHECK THE AMBIENT AIR QUALITY SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect HVAC control module C294A

Disconnect in-vehicle temperature sensor C233.

Disconnect ambient air quality sensor C1744.

Disconnect BCM fuse 21 (5A).

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C1744-1		Ground
C1744-2		Ground
C1744-3		Ground

Is any voltage present?

Yes

REPAIR the circuit in question.

GO to V2

V2 CHECK THE AMBIENT AIR QUALITY SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C1744-1 Ground

C1744-3 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to V3

No	REPAIR the circuit in question.

V3 CHECK THE AMBIENT AIR QUALITY SENSOR CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C1744-1 BCM fuse 21 socket

Click to display connectors

Positive Lead Measurement / Action Negative Lead

C1744-2 Ground

Click to display connectors

Positive Lead Measurement / Action Negative Lead

C1744-3 C294A-15

Are the resistances less than 3 ohms?

Yes

GO to V4

No	REPAIR the circuit in question.

V4 CHECK THE AMBIENT AIR QUALITY SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C1744-1		C1744-2
C1744-1		C1744-3
C1744-2		C1744-3

Are the resistances greater than 10,000 ohms?

Yes

INSTALL a new ambient air quality sensor.
REFER to the appropriate procedure in Group 412.
TEST the system for normal operation. If the concern is still present, GO to V5

No	REPAIR the circuits.

V5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST W: EXTERNALLY CONTROLLED VARIABLE DISPLACEMENT COMPRESSOR (EVDC) PERFORMANCE CHECK WITH OR WITHOUT DTC (DIAGNOSTIC TROUBLE CODE) P06A0

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The externally controlled variable displacement compressor is electronically controlled by the PCM . The PCM pulse width modulates the ground to the externally controlled variable displacement compressor to change the displacement of the A/C compressor.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P06A0:00	Variable A/C Compressor Control Circuit: No Sub Type Information	The PCM senses unexpected voltage on the sensor feedback circuit, indicating a short to voltage, an open circuit or an open sensor.

Possible Sources

Fuse
Wiring, terminals or connectors
Low refrigerant charge
A/C compressor
PCM

Visual Inspection and Pre-checks

BJB fuse 22 (10A)
Verify the A/C compressor belt is OK.
Verify the A/C compressor clutch is engaged/operating.

W1 EXTERNALLY CONTROLLED VARIABLE DISPLACEMENT COMPRESSOR (EVDC) PERFORMANCE CHECK WITH THE A/C COMPRESSOR ELECTRONIC CONTROL VALVE TESTER

NOTE: Make sure the Air Conditioning (A/C) Compressor clutch is on or is engaged in this step.

NOTE: Proper Air Conditioning (A/C) system diagnosis on a vehicle's compressor is dependent on correct refrigerant system charge and tested in ambient temperatures above 21.1°C (70°F).

NOTE: Make sure the EVDC100 Tester, the EVDC101 valve harness module, (and the connector adapter EVDC102, if required) are properly connected per the instruction manual and the operation video.

Test the EVDC compressor displacement, following the instructions in the user manual supplied with the Model EVDC®100 A/C Compressor Electronic Control Valve Tester and the EVDC 100 Tester Operation video found on the Ford PTS Home tab, Technical Support Videos.

Did the suction low side pressure decrease or the high side pressure increase?

Yes

The Externally Controlled Variable Displacement Compressor (EVDC) is able to change the displacement. Do not replace the compressor.
If DTC P06A0 is present, GO to W2
If DTC P06A0 is not present, TEST the system for normal operation. CARRY OUT the appropriate Refrigerant System Tests. REFER to the appropriate General Procedure in Group 412-00.

No	If the A/C compressor clutch does not operate, GO to Pinpoint Test H If the A/C compressor clutch was on or engaged, GO to W2

W2 CHECK FOR VOLTAGE TO THE A/C (AIR CONDITIONING) COMPRESSOR CONTROL SOLENOID

Ignition OFF.

Disconnect A/C Compressor Control Solenoid C130 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C130-2 Ground

Is the voltage greater than 11 volts?

Yes

GO to W3

No	VERIFY the BJB fuse 22 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short.

W3 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect PCM 1.0L A/T C1232B, 1.0L M/T C1233B, 1.5L Duratec A/T C1926B or 2.0L Duratec C1915B .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C130-1 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to W4

W4 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C130-1 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to W5

No	REPAIR the circuit.

W5 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR DISPLACEMENT CONTROL VALVE CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:
Click to display connectors
1.0L A/T

Positive Lead Measurement / Action Negative Lead

C130-1 C1232B-41

Click to display connectors
1.0L M/T

Positive Lead Measurement / Action Negative Lead

C130-1 C1233B-41

Click to display connectors
1.5L A/T

Positive Lead Measurement / Action Negative Lead

C130-1 C1926B-69

Click to display connectors
2.0L

Positive Lead Measurement / Action Negative Lead

C130-1 C1915B-41

Is the resistance less than 3 ohms?

Yes

If the Externally Controlled Variable Displacement Compressor (EVDC) is able to change the displacement as tested in step 1, Do Not Replace the compressor. CLEAR the DTC and REPEAT the PCM self-test. If the DTC returns, GO to W6
If the Externally Controlled Variable Displacement Compressor (EVDC) is not able to change the displacement as tested in step 1 , CLEAR the DTC and GO to W7

No	REPAIR the circuit.

W6 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Connect the PCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

Click here to access Guided Routine (PCM).

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

W7 CHECK AIR CONDITIONING COMPRESSOR CONNECTOR PINS

Ignition OFF.

Disconnect and inspect all electrical connectors on the compressor

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all Compressor electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new A/C compressor. REFER to the appropriate Removal and Installation procedure in Group 412-00.

No	The system is operating correctly at this time. The concern may have been caused by connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST X: P193E

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The PCM controls the A/C compressor clutch field coil based on messages received from the BCM over the HS-CAN1 . When the HVAC control module determines it is necessary to activate the A/C compressor due to driver request or automatic climate control settings, the HVAC control module sends a message to the BCM over the MS-CAN , the BCM then sends a message to the PCM to activate the A/C compressor.

An internal failure of the PCM , BCM or HVAC control module, or a failure in the MS-CAN or HS-CAN1 , causes the PCM to set a DTC .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P193E:00	A/C Clutch Request Signal: No Sub Type Information	This DTC sets when the PCM does not receive the A/C enable request from the BCM .

Possible Sources

Network concerns
BCM
PCM
HVAC control module

X1 VERIFY THE CUSTOMER CONCERN

Ignition ON.

Verify there is an observable symptom present.

Is an observable symptom present?

Yes

GO to X2

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

X2 CHECK THE COMMUNICATION NETWORK

Using a diagnostic scan tool, carry out the Network Test.

Do the BCM , PCM and the HVAC control module pass the Network Test?

Yes

GO to X3

No	DIAGNOSE the BCM , PCM or HVAC control module does not communicate with the diagnostic scan tool.

X3 CHECK THE PCM (POWERTRAIN CONTROL MODULE) A/C (AIR CONDITIONING) REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION)

Start the engine.

Using a diagnostic scan tool, monitor the PCM AC_REQ PID .

On the HVAC controls, select PANEL mode, then press the A/C button (indicator ON).

Does the AC_REQ PID display YES when the A/C button indicator is illuminated?

Yes

GO to X7

GO to X4

X4 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE A/C (AIR CONDITIONING) SWITCH (CC_SW_AC) PID (PARAMETER IDENTIFICATION)

Using a diagnostic scan tool, monitor the HVAC control module CC_SW_AC PID while pressing and releasing the A/C button.

Does the PID display Active when the A/C button indicator is illuminated?

Yes

GO to X6

GO to X5

X5 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

X6 VERIFY CORRECT BCM (BODY CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all BCM electrical connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect all BCM electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new BCM .
REFER to: Body Control Module (BCM) (419-10 Multifunction Electronic Modules, Removal and Installation).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

X7 VERIFY CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM electrical connectors.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect all PCM electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

Click here to access Guided Routine (PCM).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST Y: P2600:00, P2601:00, P2602:00, P2603:00

Refer to Wiring Diagrams Cell 23 for schematic and connector information. Refer to Wiring Diagrams Cell 27 for schematic and connector information.

Normal Operation and Fault Conditions

Cabin Heater Coolant Pump (if equipped), REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P2600:00	Coolant Pump 'A' Control Circuit/Open: No Sub Type Information	This DTC sets when the PCM senses an open on the cabin heater coolant pump circuits.
PCM P2601:00	Coolant Pump 'A' Control Circuit Performance/Stuck Off: No Sub Type Information	This DTC sets when the PCM senses any of the following conditions: Dry-Run leads to cabin heater coolant pump running without resistance Over Temperature Over/Under Voltage Impeller Stall Impeller Speed below minimum speed Internal Error Pump communication signal unrecognized
PCM P2602:00	Coolant Pump 'A' Control Circuit Low: No Sub Type Information	This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it high, indicating a short to ground to the cabin heater coolant pump.
PCM P2603:00	Coolant Pump 'A' Control Circuit High: No Sub Type Information	This DTC sets when the PCM senses low voltage on the PWM circuit when commanding it high, indicating an open circuit to the cabin heater coolant pump.

Possible Sources

Wiring, terminals or connectors
Low coolant or air in the coolant system
Cabin heater coolant pump
PCM

Visual Inspection and Pre-checks

Inspect for loose or corroded PCM and A/C compressor connections.
Make sure BJB fuse 22 (10A) is OK.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Y1 CHECK THE ENGINE COOLANT LEVEL

NOTE: Allow the engine to cool before checking the engine coolant level.

Make sure that the vehicle is on a level surface.

Make sure that the steering wheel is set to the straight ahead position.

Ignition OFF.

Visually inspect the engine coolant level at the degas bottle.

Is the coolant level within specifications?

Yes

GO to Y2

No	DIAGNOSE the low coolant condition. REFER to the appropriate procedure in Group 303-03 Diagnosis and Testing.

Y2 CHECK FOR AND CLEAR PCM (POWERTRAIN CONTROL MODULE) DIAGNOSTIC TROUBLE CODES AND COMMAND THE CABIN HEATER COOLANT PUMP ON

Ignition ON.

Using a diagnostic scan tool, CARRY OUT the PCM self-test. Record the PCM Diagnostic Trouble Codes (DTCs). CLEAR all PCM Diagnostic Trouble Codes (DTCs).

Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID . Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.

Access the PCM and control the COOLANT_PMP_A PID

Access the PCM and monitor the COOLPMP_A_STAT PID

Is DTC P2600, P2601, P2602 or P2603 received or is the coolant pump not running?

Yes

GO to Y3

GO to Y6

Y3 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect BJB fuse 22 (10A).

Disconnect PCM 1.0L A/T C1232B or 2.0L C1915B .

Disconnect Cabin heater coolant pump C163 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C163-1		Ground
C163-2		Ground
C163-3		Ground

Is there any voltage present?

Yes

REPAIR the circuit.

GO to Y4

Y4 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C163-2 Ground

C163-3 Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to Y5

No	REPAIR the circuit.

Y5 CHECK THE CABIN HEATER COOLANT PUMP CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C163-1 Ground

Click to display connectors

Positive Lead Measurement / Action Negative Lead

C163-2 BJB fuse 22 (10A) cavity, component side

Click to display connectors
1.0L A/T

Positive Lead Measurement / Action Negative Lead

C163-3 C1232B-80

Click to display connectors
2.0L

Positive Lead Measurement / Action Negative Lead

C163-3 C1915B-3

Are the resistances less than 3 ohms?

Yes

GO to Y6

No	REPAIR the circuit.

Y6 CHECK FOR CORRECT CABIN HEATER COOLANT PUMP OPERATION

Ignition OFF.

Disconnect Cabin heater coolant pump C163 .

Repair:
- corrosion (replace connector or terminals – clean module pins)
- damaged or bent pins – replace terminals/pins
- pushed-out pins – replace pins as necessary

Connect all disconnected connectors-components. Make sure they seat and latch correctly.

Ignition ON.

Using a diagnostic scan tool, CLEAR all PCM Diagnostic Trouble Codes (DTCs) and CARRY OUT the PCM self-test.

Using the diagnostic scan tool, active command the cabin heater coolant pump on and allow it to run for a minimum of 5 minutes and monitor the status of the cabin heater coolant pump status PID . Confirm if the cabin heater coolant pump is running by feeling or hearing the pump for vibration.

Access the PCM and control the COOLANT_PMP_A PID

Access the PCM and monitor the COOLPMP_A_STAT PID

Does the cabin heater coolant pump run?

Yes

If the cabin heater coolant pump runs for 10 seconds on and 10 seconds off for the first 2 minutes, and tries to restart every 10 seconds, BLEED the air from the coolant system. REFER to the appropriate Engine Cooling System Draining, Vacuum Filling and Bleeding General Procedure in Group 303-03.
If the cabin coolant pump runs continuously, the system is operating correctly at this time. The concern may have been caused by pump connections. ADDRESS the root cause of any connector or pin issues.

No	INSTALL a new cabin heater coolant pump. REFER to the appropriate Removal and Installation procedure in Group 412-00. CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the PCM self-test. TEST the system for normal operation. If the concern is still present, GO to Y7

Y7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the PCM connectors.

Repair:
- corrosion (replace connector or terminals – clean module pins)
- damaged or bent pins – replace terminals/pins
- pushed-out pins – replace pins as necessary

Connect the PCM connectors. Make sure they seat and latch correctly.

Operate the system and verify the concern is still present.

Is the concern still present?

Yes

Click here to access Guided Routine (PCM).

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST Z: U0253:00

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The HVAC uses information contained in messages from the APIM sent on the HS-CAN3 for 5 seconds.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC U0253:00	Lost Communication With Accessory Protocol Interface Module: No Sub Type Information	This DTC sets in the HVAC module if data messages received from the APIM are missing for 6 seconds.

Possible Sources

Vehicle communication bus
APIM
HVAC control module

Z1 CHECK THE COMMUNICATION NETWORK

Ignition ON.

Using a diagnostic scan tool, perform network test.

Does the APIM pass the network test?

Yes

GO to Z2

Z2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE APIM (SYNC MODULE) SELF-TEST

Using a diagnostic scan tool, perform APIM self-test.

Check for Diagnostic Trouble Codes (DTCs) from the APIM self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes

DIAGNOSE the battery voltage Diagnostic Trouble Codes (DTCs). Refer to the appropriate section in Group 415 for the procedure.

GO to Z3

Z3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) CONTROL MODULE SELF-TEST

Check for recorded Diagnostic Trouble Codes (DTCs) from the HVAC module self-test.

Is DTC U3003:16 or DTC U3003:17 recorded?

Yes

GO to Pinpoint Test U

GO to Z4

Z4 RECHECK THE HEATING, VENTILATION, AND AIR CONDITIONING (HVAC) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

Clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Repeat the HVAC control module self-test.

Is DTC U0253:00 retrieved again?

Yes

GO to Z5

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

Z5 CHECK FOR DIAGNOSTIC TROUBLE CODE (DTC) U0253:00 SET IN OTHER MODULES

Using a diagnostic scan tool, clear all Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Wait 10 seconds.

Ignition ON.

Using a diagnostic scan tool, retrieve all Continuous Memory Diagnostic Trouble Codes (CMDTCs).

Is DTC U0253:00 set in any other modules?

Yes

GO to Z6

GO to Z7

Z6 CHECK FOR CORRECT APIM (SYNC MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the APIM connector.

Repair:
- corrosion (install new connector or terminals – clean module pins)
- damaged or bent pins – install new terminals/pins
- pushed-out pins – install new pins as necessary

Reconnect theAPIM connector. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new APIM . Refer to the appropriate section in Group 415 for the procedure.

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

Z7 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AA: THE ELECTRIC BOOSTER HEATER IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY

NOTE: Diagnose and repair all HVAC control module Diagnostic Trouble Codes (DTCs) before continuing with this pinpoint test.

Refer to Wiring Diagrams Cell 53 for schematic and connector information.

Normal Operation and Fault Conditions

Electric Booster Heater (if equipped), REFER to: Supplemental Climate Control - System Operation and Component Description (412-03 Supplemental Climate Control, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B1474:11	Heater Relay 1: Circuit Short To Ground	This DTC sets when the HVAC control module detects a short to ground or an open on the heater 1 control circuit.
HVAC B1474:15	Heater Relay 1: Circuit Short To Battery Or Open	This DTC sets when the HVAC control module detects an open or a short to voltage on the heater relay 1 control circuit.
HVAC B147A:11	Heater Relay 2: Circuit Short To Ground	This DTC sets when the HVAC control module detects a short to ground on the heater relay 2 control circuit.
HVAC B147A:15	Heater Relay 2: Circuit Short To Battery Or Open	This DTC sets when the HVAC control module detects an open or a short to voltage on the heater relay 2 control circuit.

Possible Sources

Fuses
Wiring, terminals or connectors
Electric booster heater
HVAC control module

Visual Inspection and Pre-checks

Make sure High Current BJB fuse 4 (70A) is OK.
Make sure BJB fuse 37 (40A) is OK.
Make sure operating conditions for the operation of the electric booster heater are met.

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.

AA1 CHECK THE VOLTAGE TO THE ELECTRIC BOOSTER HEATER RELAYS VOLTAGE SUPPLY CIRCUITS

Ignition OFF.

Disconnect Electric booster heater relay 1.

Disconnect Electric booster heater relay 2.

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Electric booster heater relay 1 socket 3 Ground

Click to display connectors

Positive Lead Measurement / Action Negative Lead

Electric booster heater relay 2 socket 3 Ground

Are the voltages greater than 11 volts?

Yes

GO to AA2

No	VERIFY BJB fuse 37 (40A) and High Current BJB fuse 4 (70A) are OK. If not OK, REFER to the Wiring Diagrams manual to identify the possible causes of the circuit short. If OK, REPAIR the circuit.

AA2 CHECK BOTH ELECTRIC BOOSTER HEATER RELAYS

Carry out the component test on both electric booster heater relays.
Refer to Wiring Diagrams Cell 149 for schematic and connector information.

Did the relays pass the component test?

Yes

GO to AA3

No	INSTALL a new electric booster heater relay.

AA3 CHECK THE ELECTRIC BOOSTER HEATER RELAY CONTROL CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C294B .

Disconnect Electric booster heater C2603 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Electric booster heater relay 1 socket 1 Ground

Click to display connectors

Positive Lead Measurement / Action Negative Lead

Electric booster heater relay 2 socket 1 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to AA4

AA4 CHECK THE ELECTRIC BOOSTER HEATER RELAY CONTROL CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Electric booster heater relay 1 socket 1 Ground

Click to display connectors

Positive Lead Measurement / Action Negative Lead

Electric booster heater relay 2 socket 1 Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to AA5

No	REPAIR the circuit.

AA5 CHECK THE ELECTRIC BOOSTER HEATER RELAY CONTROL CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

Electric booster heater relay 1 socket 1 C294B-7

Click to display connectors

Positive Lead Measurement / Action Negative Lead

Electric booster heater relay 2 socket 1 C294B-8

Are the resistances less than 3 ohms?

Yes

GO to AA6

No	REPAIR the circuit.

AA6 CHECK THE ELECTRIC BOOSTER HEATER VOLTAGE CIRCUITS FOR AN OPEN

Connect Electric booster heater relay 1.

Connect Electric booster heater relay 2.

Ignition ON.

Select floor and full heat on the HVAC controls.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C2603-1 Ground

C2603-2 Ground

Is the voltage greater than 11 volts?

Yes

GO to AA7

No	REPAIR the circuit.

AA7 CHECK FOR CORRECT ELECTRIC BOOSTER HEATER OPERATION

Disconnect and inspect the electric booster heater electrical connector (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect the electric booster heater electrical connector. Make sure it seats and latches correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

INSTALL a new electric booster heater.
REFER to: Electric Booster Heater (412-03 Supplemental Climate Control, Removal and Installation).
TEST the system for normal operation. If the concern is still present, GO to AA8

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

AA8 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AB: THE INSTRUMENT PANEL CONSOLE SWITCH ASSEMBLY - AUTO START-STOP DEACTIVATION INDICATOR IS INOPERATIVE OR DOES NOT OPERATE CORRECTLY

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

The instrument panel console switch assembly - auto start-stop deactivation switch, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description (412-00 Climate Control System - General Information, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B12CA:11	Start/Stop 'Eco-Start' Status Indicator: Circuit Short To Ground	This DTC sets when the HVAC control module senses lower than expected voltage on the switch circuits, indicating a short to ground.
HVAC B12CA:15	Start/Stop 'Eco-Start' Status Indicator: Circuit Short To Battery Or Open	This DTC sets when the HVAC control module senses greater than expected voltage on the switch circuits, indicating a short to voltage.

Possible Sources

Wiring, terminals or connectors
Instrument panel console switch assembly
HVAC control module

Visual Inspection and Pre-checks

Inspect BCM fuse 21 (7.5A).

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

AB1 VERIFY THE INSTRUMENT PANEL CONSOLE SWITCH ASSEMBLY - AUTO START-STOP DEACTIVATION SWITCH INDICATOR ILLUMINATION FUNCTION

Ignition ON.

Depress the instrument panel console switch assembly - auto start-stop deactivation switch and verify that the indicator in the switch illuminates.

Does the indicator in the switch illuminate when pressed, and turn off when pressed again?

Yes

DIAGNOSE the auto stop-start indicator is never or always on. REFER to the appropriate procedure in 413-01.

GO to AB2

AB2 CHECK THE INSTRUMENT PANEL CONSOLE SWITCH ASSEMBLY - AUTO START-STOP DEACTIVATION SWITCH INDICATOR AND LED (LIGHT EMITTING DIODE) CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C294B .

Disconnect Instrument panel console switch assembly C202 .

Ignition ON.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294B-23 Ground

C294B-24 Ground

Is any voltage present?

Yes

REPAIR the affected circuits.

GO to AB3

AB3 CHECK THE INSTRUMENT PANEL CONSOLE SWITCH ASSEMBLY - AUTO START-STOP DEACTIVATION SWITCH INDICATOR AND LED (LIGHT EMITTING DIODE) CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294B-23 Ground

C294B-24 Ground

Are the resistances greater than 10,000 ohms?

Yes

GO to AB4

No	REPAIR the affected circuits.

AB4 CHECK THE INSTRUMENT PANEL CONSOLE SWITCH ASSEMBLY - AUTO START-STOP DEACTIVATION SWITCH INDICATOR AND LED (LIGHT EMITTING DIODE) CIRCUITS FOR AN OPEN

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294B-23 C202-4

C294B-24 C202-7

Are the resistances less than 3 ohms?

Yes

GO to AB5

No	REPAIR the affected circuits.

AB5 CHECK THE INSTRUMENT PANEL CONSOLE SWITCH ASSEMBLY - AUTO START-STOP DEACTIVATION SWITCH INDICATOR AND LED (LIGHT EMITTING DIODE) CIRCUITS FOR A SHORT TOGETHER

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C202-4 C202-7

Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new instrument panel console switch assembly. TEST the system for normal operation. If the concern is still present, GO to AB6

No	REPAIR the circuits.

AB6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

PINPOINT TEST AC: C1B14:11, C1B14:12

Refer to Wiring Diagrams Cell 55 for schematic and connector information.

Normal Operation and Fault Conditions

A 5-volt reference voltage and ground is supplied to the climate control sensors and actuators from the HVAC control module.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC C1B14:11	Sensor Supply Voltage A: Circuit Short To Ground	This DTC sets when the module senses less than 5 volts on the sensor reference voltage circuit, indicating a short to ground.
HVAC C1B14:12	Sensor Supply Voltage A: Circuit Short To Battery	This DTC sets when the module senses greater than 5 volts on the sensor reference voltage circuit, indicating a short to voltage.

Possible Sources

Wiring, terminals or connectors
HVAC control module

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

AC1 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE SELF-TEST

Ignition ON.

Using a diagnostic scan tool, perform HVAC control module self-test.

Is DTC C1B14:11 present?

Yes

GO to AC2

GO to AC5

AC2 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect HVAC control module C294A .

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294A-3 Ground

Is the resistance greater than 10,000 ohms?

Yes

GO to AC3

No	REPAIR the circuit.

AC3 CHECK THE REFERENCE VOLTAGE CIRCUIT AND THE SIGNAL RETURN CIRCUIT FOR A SHORT TOGETHER

Ignition OFF.

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294A-3 C294A-2

Is the resistance greater than 200 ohms?

Yes

GO to AC6

GO to AC4

AC4 CHECK THE A/C (AIR CONDITIONING) COMPONENTS

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294A-3 C294A-2

While measuring the resistance, disconnect the following components one at a time, in order. Stop disconnecting components if the measured resistance rises above 200 ohms.
- (If equipped with air inlet door actuator with 5 circuits), Air inlet door actuator C289
- Air distribution door actuator C236
- Temperature door actuator C2093

Did the resistance rise above 200 ohms?

Yes

INSTALL a new actuator (the last one to be disconnected). Refer to the appropriate section in Group 412 for the procedure. When installing an actuator, CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected.

No	REPAIR the circuit.

AC5 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C228A .

Measure:
Click to display connectors

Positive Lead Measurement / Action Negative Lead

C294A-3 Ground

Is any voltage present?

Yes

REPAIR the circuit.

GO to AC6

AC6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

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NOTICE: During engine repair procedures, cleanliness is extremely important. Any foreign material, including any material created while cleaning gasket surfaces, that enters the oil passages, coolant passages or the oil pan can cause engine failure.

Remove the timing chain.
Refer to: Timing Chain (303-01C Engine - 2.0L Duratec-HE (129kW/175PS), Removal and Installation).
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